Rob Seaman of the Catalina Sky Survey talks about time, and why you need to know the time to discover asteroids and comets. He explains how he installed a highly accurate clock, and makes the case that "natural time" is better than "cold, heartless atomic time."
Dr. Dave Tholen talks about near-Earth asteroids. He explains why they can be difficult to observe, and how he manages to spot them anyway. He also tells the story of a particularly famous asteroid that he discovered, and sets the record straight about its name.
The James Webb Space Telescope hasn't launched yet, but scientists already have plans to use it. Dr. Kartaltepe talks about how she'll use it to study galaxies. She's interested in the first galaxies that ever formed, as well as galaxies at a wide range of distances from Earth.
Urey Prize winner Dr. Francesca DeMeo stops by the show to talk about her asteroid research. She explains what a differentiated asteroid is, and tells us about her asteroid classification system. She also shares a new result, and explains how it may change the way we think about solar system formation.
Dr. Matthew Payne talks about his exoplanet research, which involves looking for periodic dimming in stars. We discuss the Kepler and TESS space telescopes, and he explains why he's so interested in measuring the masses of exoplanets.
Dr. Joanna Carey talks about her research on our home planet, Earth. She explains how the climate change we're experiencing is ten times faster than any in geologic history. We also discuss why small changes in carbon emissions today will make a huge difference to the future climate, and things everyday people can do to mitigate the damage.
Dr. Alejandro Soto returns to the show to talk about how lakes on Titan and on Earth influence the nearby atmosphere. He talks about how lakes create breezes that allow for sailing on Earth, and how the situation changes on Titan.
Dr. Matt Holman, head of the Minor Planet Center in Cambridge, Massachusetts, stops by to talk asteroids. The Minor Planet Center handles about a hundred thousand asteroid observations a night, from observatories all around the world. He talks about the difficulties in linking asteroid observations, and the discovery of the first interstellar asteroid, 'Oumuamua.
Dr. Luisa Rebull returns to the show to describe new research with the Kepler space telescope. Her ingenious study takes advantage of Kepler's strengths, and has produced results that stump theorists. Dr. Rebull explains why this data has given her "a whole new appreciation for post office workers."
Dr. Sebastiano Padovan talks about the planet closest to the sun, Mercury. He compares the evolution of planets to movies, and says that understanding a planet's history from its current state is like trying to figure out the plot of an entire movie from a single snapshot. He also explains why Mercury is "a favorite" of scientists who do computational modeling.
Tim Thompson, former JPL scientist and member of the Mt. Wilson Institute Board of Trustees, talks about the Mt. Wilson Observatory. He explains why he doesn't operate the Mt. Wilson telescopes himself, and tells us why astronomers hate the twinkling of the stars. This episode was recorded on location, and Tim talks about the many public events offered at Mt. Wilson.
Dr. Ingrid Daubar returns to the show to tell us about the InSight mission to Mars. InSight carries a seismometer and a self-hammering heat probe, and will explore the interior of the planet. She tells us what it was like to be at InSight's launch, and explains how the mission's landing site was selected.
Dr. Shohini Ghose talks about quantum entanglement, which she describes as an "amazing, weird handshake across space and time." She tells us about quantum information science, which finds useful applications for the weird quantum qualities of particles.
Dr. Burçin Mutlu-Pakdil talks about her amazing discovery-- a galaxy with both an inner and outer ring. The existence of such a galaxy had not been predicted before she discovered it, and there's no theory yet that can explain how such an unusual object was created.
Dr. Michele Koppes returns to the show to talk about her experiences studying glaciers in the field. She describes what a glacier sounds like at night, and why a good glaciologist is generally handy with a soldering iron.
Dr. Rosalie McGurk talks about her quest to find pairs of black holes. She explains how she used several different telescopes to solve this problem, narrowing the list of potential candidates from hundreds of thousands to about twenty.
Dr. Tom Connor stops by the show to talk about massive galaxy clusters and the CLASH project. We talk about naturally occurring gravitational "telescopes" that allow us to see even farther into space, and Dr. Connor makes some fun analogies to cupcakes and crime bosses.
Dr. James Tuttle Keane discusses why Pluto probably has a huge underground ocean. To make this discovery, he used images of Pluto taken by the New Horizons spacecraft, computer simulations, and good old-fashioned pen and paper.
Dr. Barbara Cohen returns to the show to talk about meteorite collecting in Antarctica. These trips, which involve weeks of camping on the ice, provide invaluable scientific samples. She talks about what it's like to search for the rocks that "don't belong" in the frozen desert.
To celebrate Earth Day, Dr. Kate Marvel talks about models of Earth's climate. She compares many models to learn more about the way our climate works, and how it might change in the future. She also offers advice for those of us who may feel overwhelmed by climate change.
Dr. Patrick Michel talks about comet 67P/Churyumov–Gerasimenko, which was visited by the Rosetta spacecraft. This comet's shape was puzzling. It looked like it had survived a collision, but how could a fragile icy comet survive a high-energy impact? A new study by Dr. Michel and his team sheds light on this mystery.
Dr. Miho Janvier talks about her work studying solar storms, and tells us about the ways these storms have impacted humans in the past. She explains why they are challenging to model and says why she's interested in "garbage" data from planetary missions.
Chase Childs tells us about satellite remote sensing. He explains how near-infrared images can expose underground structures, and why plant health is of surprising interest to archeologists. He also talks about GlobalXplorer, and some of the site's power users who have painstakingly mapped Peru.
Dr. Sarah Parcak explains how she uses satellite images to locate archeological sites, and how it's her job to be a detective, piecing together clues to uncover the past. She also talks about GlobalXplorer, a non-profit that lets everyone be a space archeologist.
Dr. Jeff Rich returns to the show to talk about the interstellar medium— all the rocks, dust, and particles that exist between the stars. After some beer, we end up talking about black holes and how Jeff studies nearby galaxies to learn about the early universe.