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Walkabout the Galaxy: Daily Summaries Delivered
by Joshua Colwell, Adrienne Dove, and James Cooney
An irreverent and informative tour of the latest, greatest, and most interesting discoveries in astronomy.
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The most recent episodes — sign up to get AI-powered summaries of each one.
- 2 days ago46 min
Second Generation Black Hole Mergers and Solar System Chaos
Exquisitely detailed measurements of the ripples in spacetime from the mergers of black holes now show that some of these merging black holes were, themselves, created by an earlier black hole merging event. While this had been suspected to take place, we now have clear evidence of it. On a less dramatic scale but much closer to home, new simulations of the early solar system suggest the large population of moons of Uranus needed help from a now long lost fifth giant planet to survive. Join us for all this, space news, trivia, and a generally good time.
- 2 weeks ago49 min
Whacky Black Hole Collisions and Strange Uranian Rings
Mysterious bright blue flashes from relatively empty parts of the universe have a new possible explanation involving, what else, black holes. We explore this new idea to explain Luminous Fast Blue Optical Transients (LFBOTs) with black hole collisions, take a peek at the black hole in our own Milky Way, and discuss some puzzling observations of two of the rings of Uranus. Plus, we have a stupid stumper, exoplanet trivia, space news, and a top quark hot take!
- 3 weeks ago47 min
Little Plutino Has An Atmosphere and Making Sense of Saturn
A Plutino, an object that shares Pluto's orbit but which is much smaller than Pluto, appears to have a very thin global atmosphere. We discuss the detection and how such a small body could hold onto even a thin atmosphere, as well as a new model that describes many of Saturn's peculiarities with a recent collision between its big moon Titan and a precursor to the sponge-y moon Hyperion. Join us for all this, space news, astronomy trivia, and much more.
- Apr 28, 202645 min
Superkilonova and Artemis II Recap
Gravitational waves and light combine to reveal what is suspected to be a superkilonova which is much cooler than the name suggests. Cool in the cool way, not the temperature way. Learn about splitting neutron stars and, in our Artemis II recap, we revisit the highs (awesome mission, great astronauts) and lows (broken space toilet) of the mission that took people a record distance from the Earth, and what's next. Plus, trivia, stumper, fake sponsor, and all the nuttiness you've come to love and miss from the astroquarks. We're back!
- Mar 18, 202640 min
A Whisper of a Hint of Primordial Black Holes plus Earth BLOBs
Gravitational Wave observatory LIGO has seen a signature that looks like the merger of primordial (pre-stellar, big bang (not big band!) era) black holes. If confirmed with future observations, this would tell us a lot about the early universe and potentially shed light on dark matter. Finally! Plus, closer to home, the BLOBs in the Earth's mantle help us untangle the complicated past of our magnetic field.
- Feb 25, 202638 min
Supermassive Black Holes Supersoaking Other Galaxies
Supermassive black holes can be terrible neighbors. New research shows that their powerful jets of charged particles can shut down star formation in neighboring galaxies within the galaxy cluster, which is just plain rude. Closer to home, our own Down Quark Audrey Martin is part of a study shedding new light (with the James Webb Space Telescope) on the mysterious L type asteroids, that formed at very high temperatures early in our solar system's history.
- Feb 18, 202646 min
Snowball Earth was Cold and Scary and the Milky Way Magnetic Field is a Mess
The Earth spent some crazy amounts of time (tens of millions of years) completely frozen over. And not, in the grand scheme of things, all that long ago. New research shows the ocean was salty and super-cold. How did life survive? New techniques using radio observations reveal a complicated and twisty galactic magnetic field. Join us for an icy, winter olympics themed episode to find out all this and more.
- Feb 5, 202641 min
Planetary Nebulae and Active Asteroids Get a Closer Look
There's always been a fuzzy line between asteroids and comets, and new observations of asteroids in the vicinity of Jupiter provide a hint to the origin of the mysterious active asteroids that look like asteroids but act like comets. Elsewhere in the galaxy, the famous ring nebula gets a new spectral image that shows the presence of band of iron. Could it be the remnants of a planet like Earth or Mercury that was vaporized when the nebular formed? Tune in for our take on this, space news, trivia and much more.
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About Walkabout the Galaxy
An irreverent and informative tour of the latest, greatest, and most interesting discoveries in astronomy.
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Frequently Asked Questions
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How often does Walkabout the Galaxy release new episodes?
Walkabout the Galaxy publishes biweekly. Our AI generates a summary within hours of each new episode.
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