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PODCAST

Walkabout the Galaxy

Joshua Colwell, Adrienne Dove, and James Cooney

An irreverent and informative tour of the latest, greatest, and most interesting discoveries in astronomy.

science natural sciences

All Episodes

46:31

The Sounds of Mars and the Lights of the Earliest Stars

Walkabout the Galaxy ·

2022/04/06

Mars has a thin atmosphere, so little changes in the weather, even breezes, make big relative changes in how sound travels. We speculate on the sounds of future baseball game on Mars before turning to a fortuitous glimpse of the light from an individual star when the universe was less than a billion years old.

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Odd Radio Circles

Walkabout the Galaxy ·

2022/03/30

No, these aren't fake relics of extraterrestrials left in fields of wheat, but they are peculiar signatures of what may be bursts of star formation in distant galaxies. We explore Odd Radio Circles, oxygen on Europa, and the history of Tolkien's Orcs.

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44:58

Ultralight Dark Matter

Walkabout the Galaxy ·

2022/03/23

What if the stuff that makes up most of the stuff in the universe is so lightweight that you could barely call it stuff? Ultralight dark matter is one possible way to explain the puzzle of the very early formation of supermassive black holes. We explore this and the intriguing origins of Ceres, and much more.

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44:58

All the Light in the Universe

Walkabout the Galaxy ·

2022/03/16

We like to think we understand ordinary matter: the stuff we're familiar with that makes up stars, planets, and donuts. Sure Dark Energy and Dark Matter are mysterious, but the rest we have a handle on. Or do we? The New Horizons mission adds to a growing puzzle about the Cosmic Optical Background, not to be confused with the Cosmic Microwave Background, which is a beast of an entirely different color!

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49:03

When Galaxy Clusters Collide

Walkabout the Galaxy ·

2022/03/09

Even the emptiness between galaxies is filled with enough energy over those vast expanses to generate shock waves and giant structures when clusters of galaxies collide. We explore this, the lives of galaxies, and some intriguing results about activity on the asteroid Ceres.

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51:19

How Smart Is Your Planet?

Walkabout the Galaxy ·

2022/03/02

We learn how binary star systems may create a second family of planets, Saturn's aurora may be powered by the ringed planet's high speed winds, and how thinking of planetary intelligence may guide future searches for extraterrestrial life.

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45:09

Psyche-ology and Generally Crazy Relativity

Walkabout the Galaxy ·

2022/02/23

A remarkably accurate test of general relativity confirms that not only does time run slower at your feet than at your head, but it runs slower at your eyes than your eyebrows. Plus, Psyche loses some of its metallic sheen, and we have spacewalk trivia and much more.

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51:47

Hot Fusion and Crashing Satellites

Walkabout the Galaxy ·

2022/02/16

Sustained fusion reactions with a net production of energy may be getting closer, and a whole bunch of space junk is definitely getting closer. A long-standing mystery of Jupiter's aurorae has been resolved. Catch up on all the space news and hear the surprising history of satellite debris with the astroquarks.

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50:37

A Bouncy Universe

Walkabout the Galaxy ·

2022/02/09

How special is the Earth for having a large Moon, and what can it teach us about where to look for habitable planets? In this episode we explore new research on what kind of planets are likely to get helpful moons like our own, and then we take a look at the idea of an infinitely cycling, but not repeating universe.

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44:38

IWOW

Walkabout the Galaxy ·

2022/02/02

Mimas, the heavily battered "death star" moon of Saturn, may harbor a sub-surface ocean of liquid water like its neighbor, Enceladus. Water may have flowed on the surface of Mars more recently than previously thought, and there's a new denizen in the menagerie of peculiar pulsars. Learn all about it and test your pulsar trivia knowledge.

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45:15

The Local Solar Bubble and Another Dusty Star

Walkabout the Galaxy ·

2022/01/19

The Astroquarks assemble to examine the mysterious of a star that is blocked out perhaps by a giant dust cloud. Meanwhile, the Sun is passing through a Local Bubble in the Milky Way that has triggered star formation all around us. Join us for all this, rainbow trivia, and more.

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44:50

Lagrange Points Everywhere

Walkabout the Galaxy ·

2022/01/12

We welcome 2022 with a look at the future home of the James Webb Space Telescope - Earth's L2 Lagrange point, and an exploration of Lagrange points around the solar system. New research suggests the geysers of Enceladus may originate in a slush pool rather than the moon's ocean, and what would it mean if there were antimatter stars? All this and more can be found on this episode of Walkabout with your happy hosts, the astroquarks.

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48:34

Q-Balls!

Walkabout the Galaxy ·

2021/12/22

One of our favorite cosmological mysteries is why there is any stuff in the universe. We're here because there was a tiny fraction more matter than antimatter created. We learn about a new observational test for one theory of why that happened, and it has to do with gravitational waves and Q-Balls! Find out what they are and learn about an odd planet and giant stellar flares closer to home.

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46:46

Eggshell Planets and the Inexorable Growth of Black...

Walkabout the Galaxy ·

2021/12/15

We take a deep dive into toffee planets with The Planetary Guy, Dr. Paul Byrne, who helps us explore the myriad types of exoplanets that might be lurking out there, including some with eggshell crusts and toffee interiors. And gravitational waves have yielded another secret, confirming Stephen Hawking's Black Hole Area Theorem. Find out all about it, and black hole trivia, on WtG.

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50:55

JWST and the Era of Reionization

Walkabout the Galaxy ·

2021/12/08

On the eve of its long-anticipated launch, we explore one of the many areas of exploration of the JWST, the early universe after the birth of the first stars and the reionization of the interstellar medium. We also take a look at a large comet showing activity beyond the orbit of Uranus, historical trivia, space news updates, and more. Join us for a walkabout the galaxy.

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50:45

Strange Atoms and Jupiter's Deep Atmosphere

Walkabout the Galaxy ·

2021/11/24

Scientists are creating large, quantum-fuzzy atomic nuclei with large numbers of neutrons to get clues about nucleosynthesis in the very early universe. Closer to home, the Juno spacecraft has peered hundreds of km below the Jovian cloud tops to better understand its colorful stripy system of bands and zones. And we get to say "fugacity" a lot in understanding exoplanet geological activity. Join us for all this, space news, and top quark trivia.

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48:40

Perpendicular Planets and a Chip Off the Old Moon

Walkabout the Galaxy ·

2021/11/17

We explore an exoplanet system where the orbits of the planets are at right angles to each other. A chunk of rock trailing the Earth around the Sun may be a chunk of the Moon, and we take a look at some of the more interesting ways of getting into space and traveling long distances once we're there.

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47:20

Galactic Protoclusters and the Heat of Information

Walkabout the Galaxy ·

2021/11/10

It's the first Strange Up Top episode of Walkabout with Hannah Sargeant where we explore the odd core of the Andromeda galaxy, the formation of galactic clusters, and the thermodynamics of information. Find out how the odd orbits of stars in Andromeda may the relics of an ancient black hole merger, how clusters of galaxies got their starts, and the strange consequences of the second law of thermodynamics.

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52:27

Sterile Neutrinos and True Polar Wander

Walkabout the Galaxy ·

2021/11/03

Meet Up Quark Hannah Sargeant as we explore the role of neutrinos in understanding the universe and the coupled evolution of Pluto's climate and spin state. A hypothesized sterile neutrino seems to be missing, extending the puzzle of dark matter. Catch up on all this and some truly odd balloon historical trivia, space news, and more.

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48:50

A World That's Out Of This Galaxy

Walkabout the Galaxy ·

2021/10/27

Almost all exoplanets have been discovered in our local neighborhood of the Milky Way, with a few exceptions due to gravitational microlensing, still within our galaxy. Astronomers have likely identified the first exoplanet in a distant galaxy by it eclipsing an X-ray source. We also check in on models of cosmological inflation, and the Moon still has surprises in store. All this, trivia, sci-fi rants, and more with the Astroquarks on Walkabout the Galaxy.

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361 results

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