I was sorely tempted to headline this post “Alien megastructures discovered in Ballard,” but that would have meant sinking low into the sort of clickbait science that concerns Dr. James Davenport. Davenport, a research scientist at the University of Washington, gave a talk about the topic at the most recent gathering of Astronomy on Tap Seattle.
Dr. James Davenport. UW photo.
Davenport described himself as a big fan of science, and noted that to be such one needs to be OK with failure.
“Being wrong is just nature telling you, no, try again. Come up with a better idea, a better explanation for how the universe is working,” Davenport said. “If you love science, you have to love the struggle and you have to love truth.”
Davenport believes that it’s important to communicate about science, but often that leads to misconceptions or outright lies. Sometimes the misinformation is silly stuff, like trying to pump up the hype about a lunar eclipse by calling it the super blood wolf coyote Moon. Sometimes it’s just wrong. An example is what now seems like the annual return of social media posts announcing that Mars is going to appear as large as a full Moon in the night sky. This particular hoax may date back to 2003, when Mars actually was closer to Earth than it had been in some 60 thousand years. The falsehood was based on a nugget of truth, and Mars was an especially good target for astronomers that summer, but if you looked up it was still just a bright red dot in the sky. When someone doesn’t see that giant Mars they might conclude that science is stupid.
“Little by little we chip away at your interest, your excitement, your enthusiasm, your belief, and your trust in science as an institution,” Davenport lamented.
Outrageous headlines
You’ve probably read many stories for which you found that the headline had little to do with the actual content. The purpose of the headline is to make you look. Davenport noted this phenomenon related to media coverage of Boyajian’s star, which brightens and dims in odd and unexpected ways. Scientists kicked around a lot of possible explanations for this observation. Maybe it’s a weird dust cloud or passing comets or debris from an asteroid collision. Someone even suggested a Dyson sphere or some other sort of “alien megastructure.” This grabbed the attention of the headline writers, and articles in Scientific American, the Washington Post, The Atlantic, Discover magazine, and others featured headlines about the possible discovery of alien megastructures, though the articles essentially said, “probably not.”
“There’s real science here but oh, golly, we need to be careful about reporting it,” Davenport said. “We have an obligation as scientists to be really careful and I worry that we’re not.” The truth about Boyajian’s star has yet to be figured out.
Where’s the rigor?
Another challenge for science communication is that there are some sites out there that are not exactly rigorous. For example, Davenport shared the following tweet from a site called Physics and Astronomy Zone.
You probably know that Pluto has not been reinstated. The tweet links to an old article—from April Fool’s Day. Also attached to that article are a slew of links to “stories” about the gifts men really want, amazing rebates for seniors, alien DNA in marijuana, and lots of other nonsense. It’s pure clickbait.
“This is a machine to get you to click on things, to get your eyeballs on things, to get you to engage with things so they make a few pennies,” Davenport said. “They do that a million times a day.”
There’s a lot of churn there. @zonephysics has more than 900 thousand Twitter followers.
“This is a huge impact for nonsense,” Davenport said. “Where is the celebration of truth?”
Few legitimate scientists have nearly so many Twitter followers. Neil deGrasse Tyson has more than 13 million, and Bad Astronomer Phil Plait has more than 615 thousand. As of this writing Davenport has 2,917. Seattle Astronomy has 2,135.
What to do
Davenport figures there are three things we can do to battle against the spread of pseudo-science and downright rubbish:
Communicate about science; don’t leave it to pseudoscientists spread misinformation
Share and intervene. Point out bunk when you see it.
Get the help of technology and tech companies to figure out how to weed out bad sources and find a way to remove the incentive for clickbait.
“We need other solutions besides just eyeball time equals dollars equals the only thing that matters on the Internet,” Davenport said. “We need tools that help us optimize for things beside just eyeball time. We need tools that help us figure out what’s the most efficient way to get knowledge across. What’s the most efficient way to help us identify bad actors who are spreading misinformation and intervening when people are trying to share that content.”
There’s some heavy lifting ahead.
“We need to do science outreach. We need help from everyone to spread truth and identify falsehoods. And we need the help of technology,” Davenport concluded. See below to watch his entire talk!
Astronomy on Tap Seattle is organized by graduate students in astronomy at the University of Washington. They’re taking a break in December and their next event will be held January 22, 2020.
There have been a slew of books published about the Moon in the last year or so as we observed the 50th anniversary of the first human steps on the lunar surface. Among the more interestingly conceived and handsomely presented of those is Moon: An Illustrated History (Sterling, 2019) by astrobiologist and science communicator Dr. David Warmflash.
Moon: An Illustrated History is more than just the story of lunar exploration. It is essentially a collection of one hundred one-page essays about key moments in the history of the Moon, each accompanied by a marvelous illustration. The book lives up to its subtitle of From Ancient Myths to the Colonies of Tomorrow. It goes back 4.5 billion years to the Moon’s formation, and along the way takes many a look at how the Moon inspired science and scholarship and culture over the years.
Knowledge is power
Knowing a lot about the Moon can be important. It would have helped a group of Chinese court astronomers back in the 22nd century BCE, who were executed by emperor Chung K’ang because they didn’t predict the occurrence of a solar eclipse. Emperors needed to know these things; the mythology of the times gave great predictive power to unusual celestial events.
Warmflash explores a number of advancements in the development of lunar calendars, the first of which appeared some ten thousand years ago during the Mesolithic era. Later the Sumerians developed some incredibly complex calendars while trying to sync up the Moon and the Sun into a year.
It’s fascinating to read about the role the Moon has played in the building of knowledge over the centuries. Warmflash takes us back in history to the time the Greeks figured out why the Moon has phases and why there are eclipses. Other chapters explain how the Moon was key to calculating the size of the solar system and how it helped astronomers make an early confirmation of general relativity.
Fantastic illustrations
Some of Moon: An Illustrated History’s more interesting illustrations look at some of the great thinkers of the past. These include folks we in the west might not have heard about, such as the Arab mathematician Ibn al-Haytham and Indian astronomer Aryabhata. Others depict more familiar names, such as one imagining a chit-chat between Halley and Newton and another depicting a confab between Kepler and Emperor Rudolf II.
Aldrin on the Moon. Photo: NASA
The last forty of the book’s chapters cover the space age, beginning with the launch of Sputnik in 1957. Many of these later chapters come along with some of the most iconic imagery of the space age, including the “Earthrise” photo shot by astronaut Bill Anders from Apollo 8 and Neil Armstrong’s portrait of Buzz Aldrin on the Moon that shows the photographer and the lunar module reflected in the subject’s mask. The articles are loaded with little tidbits about lunar exploration that you probably didn’t know.
The final few chapters turn an eye to the future of exploration and possible settlement of the Moon.
Strongly recommended
Each of the chapters of Moon: An Illustrated History is cross-referenced to others that take on similar topics, so the reader can easily follow a particular thread. It’s a well-done volume that would make a fine gift for any Moon-o-philes on your list. Warmflash says that the book is available in Seattle at Elliott Bay Book Company, the Queen Anne Book Company, Island Books on Mercer Island, Barnes and Noble, and possibly others. If you buy through Amazon by clicking the book cover above or the link in the first paragraph of this article, Seattle Astronomy receives a small fee that helps support our site. We appreciate that!
Finally, Warmflash notes that he, along with Apollo 17 astronaut Harrison Schmitt and others, is featured in a documentary called Oregon’s Moon Country that will air December 16 on Oregon Public Broadcasting. You can stream online as well; details in the link above.
All good streaks must come to an end, like Joe DiMaggio’s 56-game hitting streak or Cal Ripken, Jr.’s consecutive games-played record of 2,632. This morning Seattle Astronomy‘s personal mark of successful astronomical observations of Sun-related events was snapped at a modest four when we failed to spot Mercury during its transit across the face of the Sun.
Conditions looked semi-hopeful shortly after sunrise that we'd see the Mercury Transit. Photo: Greg Scheiderer.
Hope of spotting Mercury remained alive until the bitter end. I arrived at Seattle’s Seacrest Park just before sunrise when the transit had already been under way and below our horizon for a couple of hours. We got a few glimpses of the Sun during the morning, most not enough to register even a glimmer of light through properly filtered optics.
Then came proof that Mother Nature can be cruel and sadistic, especially to those who would practice astronomy in Seattle. With the transit slated to end at about 10:04 a.m. PST, the clouds parted a bit at about 10:02, setting off a mad scramble to point, focus, and look. I thought I caught the barest edge of Mercury leaving the disk of the Sun, but I couldn’t be sure. There were lots of clouds in the view. The Sun was there but Mercury, true to his fleet-of-foot reputation, was gone. I count it as a nice try.
Not everyone who came to our viewing event was skunked. Seattle-based Associated Press photographer Elaine Thompson caught this shot during a brief clearing:
It pays to be prepared! The day was not a total loss. Many folks enjoyed a look at the Mercury-free Sun after the transit, a nice woman named Liz brought some Top Pot donuts to share, and hanging around at the beach waiting to spot Mercury with some new friends was not a bad way to spend a Monday morning.
There will not, however, be another Mercury transit until 2032, and not one visible from North America until 2049. See you down at Seacrest Park in thirty years!
When there’s talk about people from planet Earth going to live somewhere else in the solar system, more often than not the envisioned destination is Mars. Daniel R. Adamo says we’re getting way ahead of ourselves on that scenario. Adamo, a co-founder of the Space Enterprise Institute who worked 60 space shuttle missions from the flight dynamics desk, gave a talk titled, “Questioning the Surface of Mars as the 21st Century’s Ultimate Pioneering Destination in Space” at the recent Pacific Northwest Aerospace Expo held at Portland State University.
Daniel R. Adamo spoke about the prospects for colonizing Mars during a presentation at the Pacific Northwest Aerospace Expo Sept. 28, 2019 at Portland State University. Photo: Greg Scheiderer.
“We’ve been brainwashed by information that is a hundred years old or more into thinking Mars is the place to go,” Adamo said. Everything from Percival Lowell’s erroneous conclusions that intelligent beings built canals on Mars to much of the science fiction of the 20th Century made the Red Planet an alluring celestial sphere for earthlings.
“Mars is a socio-cultural destination,” Adamo said.
Adamo draws a distinction between exploration and pioneering of Mars, and he’s all for the former, though he contends robots remain best suited for discovery.
“If the aim is to explore as much as possible, telepresence from a moon of Mars is cheaper, more productive, and more safe than putting people on the surface,” he said. With a control center on Deimos, for example, people could operate rovers and such without the lengthy communication lag that makes that more of a challenge from Earth.
For those who would extract resources from Mars, Adamo points out that there’s nothing there we can’t get at home, and if there was some sort of useful new mystery ore it would still be safer to have robots do the mining.
Problems with colonizing Mars
For a colony on Mars to make sense, Adamo says a number of things have to happen. There has to be a reason to go. The colony needs an economy. And people need to be able to survive and thrive there. At present, he contends none of those things are true.
He noted that human migration has always happened for a reason, whether it was war, famine, pestilence, oppression, or some other condition that made people feel their backs were up against the wall. There’s also no credible threat to our survival here like an impending asteroid strike. There’s simply no reason to leave Earth and live somewhere else. If there was, Adamo says there’s been no way shown to sustain such a colony; there’s no business plan.
“Ultimately, you’d better return sustained profits because even if you’re just a colony you’d better send some resources to the mother country to justify all of those finished goods that they’re sending you that make quality of life possible,” he said. “You’re not going to be mooching off the taxpayers.”
Survivability is the biggest challenge Adamo sees to Mars colonization. Solar and cosmic radiation would force people to live under ground; it’s not the most appealing notion, but he contends regular work on the surface of Mars is not realistic if you want to live long. The biggest wild card he sees is gravity. It’s a complete unknown whether humans could procreate on Mars, where gravity is just 38 percent as strong as it is on Earth. Without children, you’re not going to put down multigenerational roots on another world.
Adamo isn’t suggesting that the notion of colonizing Mars be abandoned, but he says we need to know a lot more before making such a move. He suggests we might study the gravity question first from habitats in low-Earth orbit and later on small bodies such as near-Earth asteroids. Then we could learn how people adapt to lower gravity. He says pioneering on Mars should only be considered if it can be shown that we can thrive there economically and biologically.
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The Pacific Northwest Aerospace Expo was hosted by the Portland State Aerospace Society, an interdisciplinary student aerospace project at Portland State University. They plan to make the expo an annual event.
The most recent gathering of Astronomy on Tap Seattle promised to take us inside the way science is really done, and delivered with tales of unexpected successes and a colossal fail that left a team of cosmologists with cosmic egg on their faces.
Leah Fulmer
Leah Fulmer, a second year graduate student in astronomy at the University of Washington, gave a talk titled “Falling with Style: How Astronomy’s Most Intriguing Discoveries Happen by Accident.” Fulmer noted that astronomers have lots of choices when it comes to their research. They can select which part of the sky to examine, what to look at, how long to look, how often to look, and in which wavelengths of light to look, just to name a few. There’s lots of potential there.
“Every time we look at the universe in a new way we discover new phenomena that we never even expected to see,” she said. Fulmer shared three historical examples of such scientific serendipity.
The first was the detection of the cosmic microwave background (CMB) back in the 1960s. At the time it was theorized that 400,000 years after the Big Bang the CMB would have left its energy throughout the universe as a result of the event. Arno Penzias and Robert Wilson had access to a big radio telescope and were working on doing some radio astronomy. The problem was that they couldn’t tweak out some pervasive and persistent noise from their observations. Meanwhile down the road some theorists at Princeton were trying to figure out how to detect evidence of the CMB. Penzias and Wilson had already done it!
“By accident they took this telescope that NASA had built for satellite communication, they stuck it out there, and they found literally the origins of the universe,” Fulmer said. “This changed our understanding of astronomy and physics as we know it and it was a really, really big deal, just by looking at something in a new wavelength.”
More recently the operators of the Hubble Space Telescope decided to pick out an empty, black part of the sky and have the scope stare at it for 100 hours. Many scientists thought this was a bit daft.
The Hubble Deep Field. Image credit: Robert Williams and the Hubble Deep Field Team (STScI) and NASA/ESA.
“They found what’s now known as the Hubble Deep Field,” Fulmer said. “They found an incredible plethora of galaxies that they never expected to see.” It revolutionized our understanding of the number of galaxies in the universe and added greatly to the types, shapes, and sizes of galaxies that we know about.
The Kepler Space Telescope found thousands of exoplanets and collected data on so many things that scientists couldn’t possibly look at all of them. They enlisted citizen scientists through Zooniverse to help examine objects.
Participants looked at the data and among their findings is an oddly behaving star for which its light curves defy explanation. We now know of it as “Tabby’s Star,” after astronomer Tabetha Boyajian, who wrote the paper about the discovery.
“To this day we don’t actually know what this star is,” Fulmer said. There have been lots of ideas about the odd light curves, from a random pack of asteroids that might be irregularly blocking light, some sort of cosmic catastrophe that kicked up debris, and even giant space structures built by an unknown civilization.
“It’s very precarious for an astronomer to suggest that this might be aliens,” Fulmer laughed, noting that the media would have a field day with that sort of thing.
The potential for discovering strange new things in the universe is about to increase. The Large Synoptic Survey Telescope is scheduled to go online in a few years, and when it does it will collect petabytes of data, doing a complete sweep of the sky every few nights for a decade.
Fulmer said a big part of her job in the project will be to help “develop an algorithm that is going to be able to systematically identify the things that we’ve never seen before.” That’s a tall order, combing all of that data for things we know about, things that have been theorized, and those that come out of the blue.
“We don’t what surprises we might find,” Fulmer said, “but that’s what makes it so exciting.”
Oops
Samantha Gilbert, a first-year graduate student in astronomy at the UW, told a story about a colossal and embarrassing failure. Her talk was titled, “Leaving the Competition in the Dust: A CMB Case Study.”
“The story I want to tell you tonight has everything: It has science. It has drama. It has egos. It has really esoteric vector math,” Gilbert said to laughter. “It encapsulates some of the things that are really wrong with how some people do science today.”
The story also involves the cosmic microwave background. Cosmologists are trying to figure out what happened between the Big Bang and the formation of the CMB 400,000 years later. A leading theory is that there was a period of inflation in the moments after the Big Bang during which the universe expanded rapidly. If that happened, it would have created gravitational waves, and those waves would have left behind a pattern in the CMB that we could recognize, called “B-mode polarization.”
A map of the cosmic microwave background. Image credit: NASA/WMAP Science Team
“B-mode polarization is an extraordinarily difficult thing to detect,” Gilbert said, “but proving it exists, proving that inflation really happened by detecting the traces of inflationary gravitational waves” would be Nobel Prize-worthy.
That’s where the intrigue starts. One group striving for this discovery had an experiment called BICEP (Background Imaging of Cosmic Extragalactic Polarization), which was followed by BICEP2, which had more sensitive detectors than the first version and more of them. They found what they were looking for. In fact, the signal of B-mode polarization was even stronger than anticipated. The team declared the discovery during a 2014 news conference at Harvard, issued a video, broke out the bubbly, and in general whipped up lots of hoopla about the discovery.
In the following months some 250 papers were published in response to BICEP2. One of them was from BICEP’s main competitor, the Planck Experiment, and their point was that BICEP’s discovery was bunk and that what they detected was not B-mode polarization, but cosmic dust.
“The fact that BICEP2 had so confidently announced a result that was so quickly disproven had a rippling effect throughout the community,” Gilbert said. “Scientists were horrified because they thought, ‘now the public is going to discredit us, they’re not going to trust us.’ Journalists were also horrified because they felt they had a role in spreading disinformation.”
They were also seeing an ugly side of the scientific community.
The need for speed
How did this happen? BICEP principal investigator Brian Keating wrote a book about their process, titled Losing the Nobel Prize (W.W. Norton & Company, 2018). Gilbert summarized their decision-making.
She said BICEP2 only looked at one wavelength of light so they could get the results as quickly as possible. They knew about the possibility of cosmic dust, but didn’t have the tools to distinguish between dust and B-mode polarization. The Planck folks were thought to have the data, and BICEP asked them to share. They declined.
This led BICEP to jump to the conclusion that Planck also had evidence of B-mode polarization and were aiming to scoop them on the discovery and dash their dreams of a Nobel Prize. So they hurried to make the announcement. This might have worked out OK, if they’d been right, but the BICEP group made one other glaring error.
“They actually hadn’t put their paper through peer review,” Gilbert noted, generating groans among the science-savvy audience at Astronomy on Tap.
“That is a no-no,” she understated. “That is a bad thing to do because peer review is what makes science credible in the first place. It’s a really important check against the dissemination of junk science. You really need other scientists to independently assess your results.”
Gilbert said the bad decisions were all motivated by fear.
“Overly competitive environments are part and parcel of an individualistic conception of science and an individualistic conception of science says that the most important thing is to get a result before your competition,” she said. “When that’s the environment that you’re working in you tend to make decisions based on fear.”
“I would argue that the reason that BICEP2 made these decisions based on fear is that they were operating in such a toxically competitive environment that it became dysfunctional,” Gilbert said. “Whether you think competition is really good for science, really bad, or somewhere in between, I think that this case study shows us that it’s really worth thinking about the ways that we systemically and interpersonally encourage competition, and how that might jeopardize our ways of knowing.”
Gilbert said there’s hope for the future. The hunt for B-mode polarization continues, and BICEP and Planck are teaming up going forward, combining their resources and know-how in the work.
“Competition might be the most efficient way to A result, but collaboration is probably the most efficient way to a RELIABLE result,” she said.
Astronomy on Tap Seattle is organized by graduate students in astronomy at the University of Washington. More info:
When we went on a road trip to a new place when I was a kid my dad would pick up a map from the nearest gas station. There were no gas stations on the way to the Moon, but the first astronauts to land there had a map anyway, thanks to the work of Harlan “Buzz” Reese and colleagues. His son, Tom Reese, talked about his father’s work at the most recent meeting of the Seattle Astronomical Society.
“What I’m honored to share tonight are images mainly from our dad’s collection, which for more than 50 years was pretty much just stuffed in boxes and cardboard tubes, but we now think of them as artifacts,” Tom Reese said. His father, who passed away in 2013, worked for many years at the Aeronautical Chart and Information Center (ACIC) in St. Louis. It was an office of the Air Force and was considered the premier mapping organization in the country. The elder Reese was a civilian who worked on the project creating charts of the Moon for NASA.
“They worked with the photographs from any source they could get, the best pictures that were available,” Reese said. That included images made by ground-based telescopes and lunar orbiters, and later photos shot by astronauts during Apollo missions. There was no image-editing software in the 1960s, but the folks at ACIC did have a cut-and-paste operation; they literally pieced together many of their charts by making copies of photographs, cutting them out, and building maps of larger areas as mosaics of many images. Some of them were huge, room-sized. They’d sometimes build these maps on the entire floor of a large room and walk around in stocking feet so as not to damage them too much. The charts include handwritten notes and tell-tale identification of the people who made them.
This photo of the Apollo 11 landing site was made by Apollo 10 and includes a handwritten overlay by Harlan Reese. Photo: Tom Reese.
“My dad’s smeared fingerprints and careful mapping marks are also a down-to-Earth tribute to the other 400,000 human beings whose efforts made the journey possible,” Reese said.
Reese, an independent journalist, photographer, author, artist, and teacher whose work as a newspaper and magazine photojournalist was nominated for Pulitzer Prizes during his career at The Seattle Times, spoke of a sense of awe and wonder when making a photograph of the Moon.
“I think it was with the same sense of wonder that my dad saved all these things that were actually scraps of his work,” Reese said, “but I also think he thought of these as a gift to be shared.”
Part of that wish came true this year, when several of the charts were included in the Destination Moon exhibit that wrapped up earlier this month at the Museum of Flight. Reese said he hopes the entire collection can some day wind up in a place where it can continue to tell a part of the story of the Apollo missions.
Tom Reese spoke about his father's Moon mapping at the Sept. 18, 2019 meeting of the Seattle Astronomical Society. Photo: Greg Scheiderer
It’s amazing to think that the lunar orbiters that preceded Apollo were shooting photos using film, processing that film in space and then sending the images to Earth via radio. Today’s digital cameras on spacecraft capture far greater resolution. For the cartographers who mapped the Moon there was a good deal of art to go with the science.
“On the early maps of the Earth you can see where they would come to the limit of the known world and simply mark down ‘terra incognita’ or ‘beyond this point there be dragons,’” Reese said. “In the early mapping of the Moon precision was key, of course. But the audacity to fire three men packed into a rattling tin can to an unexplored world also required calculating on the unforeseen.” The mappers analyzed all of the data they had to give accurate representation of the sizes of and distances between lunar features so that the maps would be useful guides.
You can see many of the images Reese shared during his presentation on his website.
If there’s a war in space it won’t involve huge fleets of ships in a shoot-‘em-up accompanied by classical music, as battle is often depicted in science fiction movies.
“Our war in space won’t be particularly a Star Wars version,” according to Linda Dawson, senior lecturer emeritus in physics and space sciences at the University of Washington Tacoma and author of the recent War in Space: The Science and Technology Behind Our Next Theater of Conflict(Springer Praxis Books, 2018). Dawson recently gave a talk about the book at the Museum of Flight.
Linda Dawson, author of War in Space, spoke Sept. 14, 2019 at the Museum of Flight. Photo: Greg Scheiderer.
“Spacecraft with weapons in space are still pretty far in the future,” Dawson said. “We’re talking decades.”
Such a conflict would likely destroy every spacecraft in orbit, according to Dawson.
“That kind of a battle would end up disastrous for everyone involved,” she said. “The war would be over in a matter of minutes if that happened just outside of Earth orbit, and it would affect us on Earth for decades.”
That’s not necessarily what is preventing it from happening.
“Space is a very harsh theater of war,” Dawson said, listing the lack of air, extreme temperatures, radiation, and space junk as just the start of the problems such a war would face.
“Access [to space] is expensive and technologically challenging,” Dawson said. “It’s not like we would choose to go to outer space to engage in a war. It’s just that we have spacecraft up there that we all depend on, and so it is an area that is intriguing to countries that don’t agree with each other.”
The likely nature of war in space
War in space would be more subtle than a bunch of big explosions. A variety of weapons, including Earth-to-space, space-to-Earth, and space-to-space varieties are possible. Lasers, missiles, and various “kill vehicles” or “jammers” could be employed to foul up orbiting assets. Space debris itself could be a weapon. Take a look at this video from NASA:
Video Credit: NASA Orbital Debris Program Office at JSC
Earth is at the center of the graphic, and each of the dots represent spacecraft, whether working or not. There’s a lot of junk out there. The Kessler syndrome is a scenario proposed in 70s by NASA scientist Donald Kessler; it posits that if there’s a dense enough amount of debris in space, then one collision or explosion could create a chain reaction of other collisions or explosions.
“Pretty soon all you have is debris out there and you can’t get through it,” Dawson said. That would make it extremely difficult to operate existing satellites or launch new ones.
We sometimes don’t realize how much we depend on space systems. Wrecking all of those satellites would mess up a lot of things, from our GPS navigation systems to television signals, data exchange, air traffic control, communication systems, and weather forecasting. It would be a total pain.
Though a number of different entities are tracking space debris, it continues to get more challenging. Space X plans to launch 12,000 cube sats to create broadband service; these smaller objects are harder to track. There are unanswered questions about who owns space debris and who can or should clean it up.
“Major spacefaring nations have all been increasingly aggressive with military and surveillance operations in space,” Dawson added.
Preventing war in space
Dawson said the notion of preventing war in space is simple on its surface. It’s the same as preventing war on Earth. You use diplomacy, establish rules of conduct, and operate with openness and cooperation. She said we need more detail than is included in the 1967 Outer Space Treaty, a United Nations effort signed by more than 100 nations that set ground rules for peaceful exploration of space, and we need to figure out if and how existing international law applies to space. It’s all easier said than done.
“The international part of it is the difficult part,” Dawson said. The US has recognized its vulnerabilities in space and is working to protect its own assets, but other countries are doing their own thing.
“I try to be hopeful, but I think the international part of it is the biggest challenge,” Dawson said.
The notion of a picture being worth a thousand words can often be an understatement. Witness the newest, just-released photo of Saturn captured by the Hubble Space Telescope.
The NASA/ESA Hubble Space Telescope’s Wide Field Camera 3 observed Saturn on 20 June 2019 as the planet made its closest approach to Earth this year, at approximately 1.36 billion kilometers (845 million miles) away. (Photo: NASA, ESA, A. Simon (Goddard Space Flight Center), and M.H. Wong (University of California, Berkeley))
This image is the second in a yearly series of snapshots taken as part of the Outer Planets Atmospheres Legacy (OPAL) project, according to news releases from the European Space Agency and the Space Telescope Science Institute. OPAL is helping scientists to understand the atmospheric dynamics and evolution of our Solar System’s gas giant planets. In Saturn’s case, astronomers will be able to track shifting weather patterns and other changes to identify trends.
It takes a lot of detective work to figure out the nature of a type Ia supernova. Celestial Pig Pens and new tricks from old telescopes are contributing to the effort. That’s what we learned at the most recent meeting of Astronomy on Tap Seattle.
Messy Siblings: Supernovae in Binary Systems
Dr. Melissa Graham is a project science analyst for the Large Synoptic Survey Telescope, working out of the Astronomy Department at the University of Washington. Her main research focus is supernovae. In particular, she’s doing a lot of work on type Ia supernovae, which occur in binary star systems. One of the stars involved will be a carbon-oxygen white dwarf star.
“It’s a star that wasn’t massive enough to fuse anything else inside the carbon layers,” Graham explained. Outer layers of hydrogen and helium are thrown off in a planetary nebula phase, so the carbon and oxygen are what’s left.
Melissa Graham. UW photo.
“Carbon-oxygen white dwarf stars are very compact, very dense, about the size of the Earth but they can be up to about 1.4 times the mass of the Sun,” Graham said. These stars are pretty stable as stars go, so they don’t blow up under normal circumstances.
“When we do see these kind of supernovae that are clearly the explosion of carbon-oxygen white dwarf stars we have to wonder why,” she said. It turns out there are two possible scenarios. The binary can be a pair of carbon-oxygen white dwarf stars that spiral in on each other, merge, and then explode. Or the binary can include one white dwarf and a more typical hydrogen-rich companion star.
“In this case the companion star can feed material onto this carbon-oxygen white dwarf star, might make it go over 1.4 solar masses, become unstable, and then explode,” Graham said.
Which is which?
The key to figuring out which of these scenarios actually occurred is to take a look at the area around the supernova. If the companion is a more hydrogen-rich companion star, the neighborhood can get a little messy.
“It’s sort of like a celestial Pig Pen star that leaves a lot of material lying around,” Graham said. A blast from a supernova can interact with this material and cause it to brighten. The trouble is that astronomers typically only observe type Ia supernovae for a couple of months; they fade quickly. So if this extra material is far away from the event, they might not see the interaction. The answer is patience, to look at the supernova sites for up to 2-3 years after.
Graham did exactly that, using the Hubble Space Telescope to keep an eye on the locations of 65 type Ia supernovae.
“Out of these 65, I very luckily found one” in which there was brightening much later. They checked the spectrum of the light and found hydrogen, a sure sign that the companion in this particular type Ia supernova was a Pig Pen. Graham suspects that up to five percent of such explosions involve messy sibling stars.
Graham looks forward to having the Large Synoptic Survey Telescope (LSST) come on line. She expects it will find some 10 million supernovae in a decade.
“This marks a massive increase in our ability to both find and characterize supernovae,” she said.
Old scope, new tricks
While we wait for LSST an old workhorse telescope is doing interesting work in a similar vein. Professor Eric Bellm of the UW works with the Zwicky Transient Facility (ZTF), which uses the 48-inch telescope at Palomar observatory in California. The scope is a Schmidt, completed in 1948, and for years it was the largest Schmidt telescope in the world. It’s main function at first was to use its wide-field view of the sky to create maps that helped astronomers point Palomar Mountain’s 200-inch Hale Telescope.
Eric Bellm. UW photo.
The 48-inch was used to do numerous sky surveys over the years. It discovered many asteroids, and Mike Brown used it to find the dwarf planets he used to kill Pluto. The old photographic plates gave way to modern CCDs, and Bellm became the project scientist for the Zwicky Transient Facility—named for astronomer Fritz Zwicky, a prolific discoverer of supernovae—in 2011.
They outfitted the scope with a new camera with 16 CCDs that are four inches per side. They got some big filters for it and put in a robotic arm that could change the filters without getting in the way of the camera. They started surveying in March of last year and can photograph much of the sky on any given night.
“That’s letting us look for things that are rare, things that are changing quickly, things that are unusual,” Bellm said.
Examples of what the ZTF has found include a pair of white dwarfs that are spinning rapidly around each other, with a period of just seven minutes. They can see the orbits decay because of gravitational wave radiation. It has discovered more than 100 young type 1a supernovae. And it found an asteroid with the shortest “year” of any yet discovered; its orbit is entirely within that of Venus.
It’s doing the same sort of work that the LSST will do when it comes online.
“It’s super cool that we’ve got this more than 70 year old telescope that we’re doing cutting-edge science with thanks to the advances of technology,” Bellm said.
Astronomy on Tap Seattle is organized by graduate students in astronomy at the University of Washington, and typically meets on the fourth Wednesday of each month at Peddler Brewing Company in Ballard. The next event is set for September 25.
As we look back at the 50th anniversary of the Apollo 11 Moon landing, Toby Smith notes that the most interesting science that came out of the mission was a bit of a surprise. Smith, a senior lecturer in astronomy at the University of Washington, gave a talk at the most recent meeting of Astronomy on Tap Seattle.
“There’s only one reason Apollo existed—to beat the Soviet Union to the surface of the Moon,” Smith noted. Few considered the mission to be scientific. “It wasn’t fully embraced by the scientific community even in its day, even among planetary scientists.”
But they figured as long as they were there, they should do some sort of science.
“This little bit of science they did fundamentally changed how we view not only the Moon, but the Earth-Moon system and our solar system,” Smith said.
The Apollo 11 landing site, the Sea of Tranquility on the Moon, is essentially an ancient lava flow, a featureless plain of cooled volcanic rock, Smith said. Think of it like Big Island of Hawaii, except you don’t really see the solidified lava on the Moon. The surface is soft, ground down and rounded off into a soft powder by billions of years of impacts. As Neil Armstrong observed just after his first step, it has the consistency of flour. That consistency almost accidentally led to the mission’s best science.
An Apollo Lunar Sample Return container on display
at the Destination: Moon exhibit at the St. Louis Science
Center in 2018. (Photo: Greg Scheiderer)
Armstrong spent about 15 minutes of the two-and-a-half hour Moon walk picking up rocks and putting them into a box. At the end he collected nine scoops of lunar regolith and dumped it into the Apollo Lunar Sample Return Container (a fancy NASA term for the case for rocks) as sort of a packing material so the larger rocks wouldn’t clatter around. If they’d taken any styrofoam peanuts he might have used those instead.
Naturally, when this material was brought back to Earth, the scientists looked at it, and Smith said it just might be the most studied geological sample ever.
Smith noted that the regolith is highly angular; lunar dust is sharp.
“This is not material that was broken up by being tumbled,” he said. “This is material that was broken up by being fractured by impacts.”
It’s a diverse sample. It contains basalt, breccia (material created by impacts that shatters and sometimes melts back together), and impact spheres. There was also one unusual, bright white material in the collection. It turned out to be anorthosite, which makes up about four percent of the sample.
“It represents a piece of the original crust of the Moon long since destroyed by four and a half billion years of impacts,” Smith explained. Anorthosite is an igneous rock, like basalt, that comes from the cooling of melted rock. Basalt is created when lava moves across the ground, but Smith noted that anorthosite doesn’t work that way.
“Anorthosite forms in big pools of lava, huge pools of lava, huge chambers of lava,” he said. “As these chambers of lava slowly cool over time, the anorthosite floats to the top.”
“If this was found on the Moon it must mean that at some point early in the Moon’s history it must have been almost completely molten,” Smith added. This information made scientists re-think their notions about the origins of the Moon.
“Before Apollo there was no indication that the whole, entire Moon was almost completely melted,” he said.
The leading theory about the formation of the Moon these days is that something pretty big, about the size of Mars, smacked into the early Earth, and that material flung into space by the impact eventually coalesced into the Moon. The catch is that computer simulations of this event don’t often result in a completely molten Moon. So more study is needed. The lunar samples have been under constant scrutiny for the last 50 years, and Smith says he’s interested to see what new information can be gleaned from those samples as new analytical technology is developed.
Astronomy on Tap Seattle is organized by graduate students in astronomy at the University of Washington. The next gathering is set for Wednesday, August 28, 2019 at Peddler Brewing Company in Ballard.
Greg gave the first of his series of talks about Apollo 11
June 29 at the Kobetich Branch of Tacoma Public Library.
Seattle Astronomy is doing our small part in celebrating the 50th anniversary of Apollo 11 and the first human landing on the Moon. Greg Scheiderer will give six talks as part of the Tacoma Public Library system’s summer reading program.
The talks, titled “Moon Walk: Apollo 11 and a Man on the Moon,” will explore the extraordinary shared experiences of the Apollo missions, look at the history that got us step-by-step up to the giant leap, share some of the iconic photography of Apollo, and, since it’s the summer reading program, offer a list of Apollo readings for adults and kids alike.
The first talk was given on Saturday, June 29, 2019 at the library’s Kobetich Branch. The rest of the schedule is as follows:
You can also find schedule information on our calendar, in our Facebook events section, and on the library’s summer reading club events calendar. Come out and join us for a fun look back at Apollo 11!
Apollo 11 command module Columbia. Photo: Eric Long,
National Air and Space Museum, Smithsonian Institution
The long-awaited exhibit Destination Moon: The Apollo 11 Mission, opens April 13 at The Museum of Flight. The centerpiece of the exhibit is the mission’s command module Columbia, which is on the last leg of a two-year, four-city journey that is the historic spacecraft’s first since being parked at the Smithsonian Air and Space Museum in Washington, D.C. in 1971. The Columbia took astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins to the Moon for the first Moon landing. The exhibit will be here through September 2, including the date of the 50th anniversary of the giant leap, July 20, 2019.
While some common elements of the exhibit have traveled to all four cities—Destination Moon stopped in Houston, St. Louis, and Pittsburgh prior to its Seattle trip—each museum has been able to put its own spin on the artifacts. At the Museum of Flight, Destination Moon represents an expansion of the Apollo exhibit that opened in May two years ago. (Here’s our article about the exhibit.) It’s here the the Museum of Flight has an edge, with the exhibit including two enormous F-1 engines that powered the launch of Apollo missions. Other museum artifacts are also included, as is a gallery about the legacy of Seattle-area industry, astronauts and engineers to the space program.
Your correspondent with the Apollo 11 command module
Columbia in August 2018 at the St. Louis Science Center.
Photo: Greg Scheiderer
Visitors can get pretty close to Columbia, but they can’t go inside. However, they can do so virtually through an interactive 3-D tour created from the Smithsonian’s high-resolution scans of the interior of the spacecraft.
The exhibit promises to be extremely popular. A free preview for museum members last weekend was well attended, and a host of special events for the first weekend are likely to draw many visitors. We were fortunate to see the exhibit in St. Louis last summer; it was near the end of the run and it wasn’t at all crowded. Waiting might be a good option if seeing it early and often isn’t a big deal for you!
The Columbia is a big deal artifact. I spent hours with it in St. Louis and a good bit of time at the member preview this week. Don’t miss this great opportunity to see a super cool piece of space history!
Attendees at the most recent gathering of the Seattle Astronomical Society went on an entertaining and informative 3-D trip to Mars, and learned that Seattle is just like the Red Planet.
Paris said he loves Mars and expects that humans will be going there sooner than later.
“I suspect that, the way things are going, probably in about 10 to 15 years we’re going to be on Mars,” he said, adding that he doesn’t think anyone is going to go it alone.
“Mars, in my personal opinion, is going to be an international effort, both with corporations as well as the government,” Paris said.
The book was something of a spinoff of an exhibit about Mars that Paris helped put together at the Museum of Science and Industry in Tampa. The exhibit proved pretty popular, and the book seemed the next natural step.
Proceeds from book sales support the work of the Center for Planetary Science.
Paris featured fantastic 3-D images of a great many Martian geological features in his presentation. While his Ph.D. is in astronomy, he’s really morphed into something of a rock hound.
“We are primarily geologists that are studying all of the geological features here on Earth,” he said, “and we’re trying to compare and contrast them with what we see on the lunar surface, what we see on Mercury, Venus, and all of the terrestrial planets.”
Paris called the process comparative planetology.
Ripple marks such as those shown in this photo from the
rover Opportunity were deposited by water moving back
and forth. Image: NASA/JPL
“If I look at something here on Earth and I can determine how that thing happened,” he said, “and I see the same thing on Mars, I can deduce that the same processes have occurred, most likely.”
That caveat was included on most of his deductions, but the comparisons are pretty compelling. For example, Paris passed around a flat piece of rock with ripple marks on it that he collected in the Canyonlands in Utah. Such ripple marks are created by water moving back and forth over the rock, and the Canyonlands piece looks exactly like stuff the rovers have seen on Mars.
Paris also showed photos of rock formations made when moving or freezing water breaks up bedrock, and wears it down into small pebbles. At least, that’s how it happens on Earth.
This set of images compares the Link outcrop of rocks on Mars with similar rocks seen on Earth. Image: NASA/JPL-Caltech/MSSS and PSI
“We call that either fragmented sidewalk or conglomerate terrain,” he said. Here in Seattle, especially after our recent cold and snowy weather, we just call it a pothole, and that’s how the Emerald City is like the Red Planet! Potholes all over the place!
Paris does a lot of rock hunting in the American southwest, which has a lot of Mars analog sites that scientists and NASA use in their Mars work. These include Moenkopi in Arizona, Canyonlands, the Mojave Desert, Death Valley, and the Flagstaff area.
The website for the Center for Planetary Science notes that Paris will make a presentation in Portland in September at a time and place not yet published. Dollars to Voodoo Doughnuts it will be with Rose City Astronomers. Stay tuned.
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Buying Paris’s book by clicking the link or book cover image above supports both the Center for Planetary Science and Seattle Astronomy.
There’s a great new website about our solar system that will blow your socks off! The Planets Online introduces viewers to a broad range of subjects in a unique, innovative, and entertaining way. The site naturally interweaves information on science, engineering, music, visual design, and technology—it could be a showcase for STEAM education (Science, Technology, Engineering, Arts, and Math).
Adrian Wyard
The site is the creation of visual artist Adrian Wyard. Followers of Seattle Astronomy may recall that we wrote about Wyard’s show The Planets Live about three years ago (story here). The concept is that Wyard uses images of celestial objects to accompany and enhance classical music. He’s done it with Gustav Holst’s The Planets, Mussorgsky’s Pictures at an Exhibition, and Dvorák’s 9th Symphony.
The core of The Planets Online is a video of a performance of The Planets by the Auburn Symphony Orchestra directed by Anthony Spain and featuring the Seattle Pacific University Women’s Choir and Wyard’s visuals. This is no ordinary video, however. If you remember when we used to get our video on plastic disks, think of The Planets Online as a video loaded with special features. As the video plays, a sidebar describes the images and who created them, offers facts about the music, pulls up Wikipedia pages and other sources about the science, throws in tidbits of trivia, and more. You can switch any of these info streams on or off depending on your interests.
Here’s a little preview video of The Planets Online.
We expect you might spend a good deal of time with the site.
There are live performances of Wyard’s work coming up this spring in Florida, Virginia, and Texas. The last northwest live performances were back in April, May, and October last year. If you missed those, you can have a little fun—and learn a few things—with The Planets Online.
The helmet and gloves used by Buzz Aldrin when he walked on
the Moon, from the Destination Moon exhibit in St.
Louis. Photo: Greg Scheiderer.
With less than a month to go until its opening, the Destination Moon exhibit about the Apollo 11 mission is taking shape at the Museum of Flight. Museum staff announced in a news release this week that the helmet and gloves used by astronaut Buzz Aldrin during his walk on the Moon have been installed in the space. The centerpiece of the exhibit is the Apollo 11 command module Columbia, but it will feature many other artifacts of the historic mission.
I saw the exhibit when it was in St. Louis last summer (story here) and it was great. It opens at the Museum of Flight April 13 and runs through September 2, a stretch of dates that includes the 50th anniversary of the July 20, 1969 “giant leap for mankind.”
There will be some differences in the exhibit from when it was in St. Louis. For example, the Museum of Flight release notes that the helmet and gloves display will include a magnifying glass so that museum visitors can read the to-do list on Aldrin’s glove reminding him of his tasks during the moonwalk. A key item on the list: get a photograph of a boot print on the Moon!
Shelley Sterns-Blackburn, ELY, Inc, and Lisa Young, Conservator at National Air and Space Museum make some final adjustments to spacesuit gloves worn by Buzz Aldrin while on the surface of the Moon. Aldrin’s helmet and visor are in place on the left. Photo Ted Huetter/The Museum of Flight.
Tickets for all dates of the exhibit are now on sale on the Museum of Flight website. Tickets are $10, or $5 for museum members, and must be purchased in addition to museum general admission, which is $25 for adults, $21 for seniors, and $16 for youth. Kids under 4 years of age are admitted free.
In addition, there is a free member preview of the exhibit scheduled for Sunday, April 7, which sounds like an excellent reason to join up today. Several free days are planned during the run of the exhibit, though no details on those have yet been published.
When I saw the exhibit at the St. Louis Science Center I went on a weekday afternoon and there were no lines or crowds; I just walked up and bought a ticket. Weekends might be a different story.
The Laser Interferometer Gravitational-wave Observatory—LIGO—is leading scientists to discoveries at an impressive clip. Just two years ago we wrote about UW Bothell physics professor Joey Shapiro Key’s talk to the Seattle Astronomical Society about the detection of gravitational waves from the merger of two stellar-mass black holes—a discovery that won the Nobel Prize. Last week at Bainbridge Island Open Mic Science Key talked about LIGO, its latest detections, and plans for even bigger science in the future.
Joey Shapiro Key
Interferometers are a simple idea. They have two perpendicular arms of equal length. Laser light is split into the two arms, hits mirrors at the far ends, and returns to the source. If something changes the length of an arm, the light waves interfere with each other. LIGO in Hanford and a twin observatory in Louisiana are huge observatories with arms four kilometers long, and they are making amazing measurements.
“When we detect the gravitational waves they are quite pristine, even from billions of light years away,” Key explained. “But it was a challenge because gravitational waves interact so weakly with matter—that’s why they’re so pristine when they reach us—they’re very hard to detect.”
How hard? Einstein, who thought up the notion of gravitational waves and did the math to explain how they would work, thought the effect was too small to ever detect. It took a century to develop the technology to do it. LIGO can detect unbelievably minute changes in the length of its arms when a wave passes through.
“This is the most sensitive measuring device in the world,” Key said of LIGO. “For those four-kilometer arms, the change in the length in the arms we measure is a thousand times smaller than the width of a proton in the center of an atom.”
Simulation by SXS
The big discovery by LIGO since Key’s previous talk came in August of 2017.
“We detected a gravitational-wave signal from two neutron stars colliding, followed immediately by a detection of a gamma-ray burst by NASA’s Fermi satellite, and this set off a worldwide search for the source of that gravitational wave signal,” Key said. More than half a dozen observatories were involved in the work, observing the event in many wavelengths across the electromagnetic spectrum and pinning down the galaxy in which the collision occurred.
“This is the first ever multi-messenger detection with gravitational waves where we’re doing observations using gravitational waves and light,” Key said. Being able to see light from the event taught us a lot.
“We really learned from this one in particular that most of the heavy elements in our universe, including what solar systems are made of, what planets are made of, and what we are made of, comes from neutron stars colliding and kilonova events,” Key noted.
Just as light has a wide range of wavelengths, so do gravitational waves. Key said LIGO can only detect a limited slice of those wavelengths. It would be not able to find gravitational waves from the collisions of supermassive black holes or from the early universe. That will take a different tool.
“The future of gravitational wave astronomy lies in experiments such as LISA, the Laser Interferometer Space Antenna, that will do laser interferometry in space,” Key said. LISA is a joint venture between NASA and the European Space Agency, but there will be a bit of a wait for it. LISA’s planned launch isn’t until 2034. In the meantime, LIGO has plenty to do, with planned upgrades that will make the detector even more sensitive.
“We really are in a brand new era of gravitational wave astronomy, and there’s a lot to be discovered,” Key said.
One of the great perks of membership in the Seattle Astronomical Society is that the speakers at its annual banquet are typically dynamite. This year’s event featured one of the giants of astronomy, David H. Levy, who has discovered 22 comets, including the famous Shoemaker-Levy 9 that slammed into Jupiter in 1994.
Levy’s talk was highly autobiographical, which is fitting because his own autobiography, A Nightwatchman’s Journey: The Road Not Taken, is scheduled to come out this summer. Levy’s story is not necessarily complete, however; he’s still at it.
“Astronomers never really retire; you certainly don’t retire from being an amateur astronomer because it’s in your blood, it’s what you do, it’s what you live for,” Levy noted.
“I don’t think I’m ever going to discover another comet,” he said. “I’m still searching, because the search is so much fun!”
Several events from his youth seemed to steer Levy to a life in astronomy. Leslie Peltier discovered the Comet Kesak-Peltier in June of 1954 when Levy was about six years old. Later, when he was in high school, Levy was assigned to do a report on a book of his choosing. He picked Starlight Nights: The Adventures of a Star-Gazer, an autobiography of Peltier that had just been released. Levy couldn’t put it down, and it remains his all-time favorite book.
His parents sent him to Twin Lake Camp for three summers, and he didn’t like it much, but one year while returning to his cabin after a fireworks display he saw a shooting star and took it as an omen.
Then, in 1960 Levy had to do a public speech on any topic. He chose comets. Just before graduation, Levy crashed while riding his bicycle and broke his arm. A cousin gave him a book about the solar system as a get-well present. He devoured it.
“Any doubt that I was going to be interested in the night sky after that was erased,” Levy said. “All there was to do was astronomy.”
Seattle Astronomy’s Greg Scheiderer (left) visited with
comet hunter and author David H. Levy at the Seattle
Astronomical Society banquet Jan. 27.
Like many astronomers amateur and professional, Levy has kept a log book with notes about all of his observing sessions. His dates back to 1959 when he saw a partial solar eclipse, and as of the end of January included an amazing 20,922 sessions.
“Each one of them I cherish,” Levy smiled, noting about note-taking that, “If you don’t write it down, you haven’t done it.”
His first session looking for comets is dated December 17, 1965. It was nearly 19 years until he found his first in 1984. He’d logged a half dozen by 1990. Most of his comet hunting was visual in the early days, but it was around 1990 that he started doing photographic searches in partnership with Gene and Carolyn Shoemaker. One of the comets they discovered together is Shoemaker-Levy 9.
The gag among comet hunters is that to get famous your discovery has to become really bright. Shoemaker-Levy 9 didn’t do that, but the spectacular collision of its fragments with Jupiter in 1994 was a historic event.
“What it’s famous for is what it taught us,” Levy said “In colliding with Jupiter, it gave Earth a lesson in the origin of life.”
“It doesn’t prove that a comet collision means that life is going to start on a world,” he added. “What it does show is that when comets collide with a world, life eventually can start. It doesn’t mean that it does, but it’s one of the ways it does.”
“We’re all the progeny of comets,” Levy said.
His presentation was enjoyable and his autobiography promises to be an engaging read. It will be his 35th book. Watch for news about it in this space later this year.
The book was something of a spinoff of an exhibit about Mars that Paris helped put together at the 
Several events from his youth seemed to steer Levy to a life in astronomy. Leslie Peltier discovered the Comet Kesak-Peltier in June of 1954 when Levy was about six years old. Later, when he was in high school, Levy was assigned to do a report on a book of his choosing. He picked 