Walkabout the Galaxy

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A New Dwarf Planet and a Glimpse of the Zeptoverse Nov 05, 2026

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The Vera Rubin Observatory's massive and rapid surveys of the sky have discovered a new dwarf planet in the Kuiper Belt, previously hidden by the bright background of the Milky Way. Many more discoveries of this type are sure to follow, while on a much different scale, an extremely rare quark decay has been observed at the Large Hadron Collider that involves length scales that are unimaginably small. Try to imagine them. We dare you. Can't be done. Join us for all this and other things to fire up the imagination.

Adventures on the Moon and Mars with a Rover Record and a New Crater Oct 25, 2026

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World records are going to have to start specifying which world we're talking about with all the activity on the Moon and Mars these days. NASA's Perseverance rover just set a new distance record for Mars, and it may be eclipsed by a huge amount if future missions go as planned. Closer to home, we have seen a once-in-a-century impact on the Moon produce a crater that is teaching us about the lunar surface. And there's lots of space news, spaceflight trivia, and more on this episode of Walkabout the Galaxy.

The Oldest Radio Burst and Chariklo's Rapidly Changing Rings Oct 17, 2026

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A new distance record has been set with the help of the JWST, spotting the distant (and therefore ancient) galaxy that produced an enigmatic fast radio burst or FURBY, detected by radio telescopes in 2024. This opens a new frontier for probing the early universe as those radio waves travel across and interact with galaxies, clusters, and the intergalactic medium before reaching us. Closer to home, new observations reveal baffling large-scale changes in the already baffling narrow rings around the small Centaur object Chariklo. Catch up on the mysteries of the universe with your friendly neighborhood astroquarks.

Backwards Exoplanet and Shrinking Mercury Sep 26, 2026

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An exoplanet has been discovered orbiting its star in the opposite direction of its star's rotation, a phenomenon that previously has only been observed in the presence of another star or massive sub-stellar object that can rotate the plane of planet's orbit. In this case, no such obvious explanation exists, suggesting that after the star formed an entire new planet formation disk accreted around the star of unknown origin. Planets close to home also continue to surprise, with a new gas escape mechanism observed at Jupiter and our friend Mercury appears to have shrunk even more than previously thought.

Have We Detected Dark Matter? Sep 15, 2026

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An intriguing detection from a dark matter experiment may be the first direct detection of a dark matter particle. This detection would mean dark matter is made of WIMPs: Weakly-Interacting Massive Particles. There's a non-negligible chance that this is an odd background detection and not dark matter, but if it is, we'll see more like it in the next few years. We also take a look at a study of what might have happened to a moon of Venus if it had formed one like Earth did, plus trivia and space news galore.

Mapping a Galaxy's Dark Matter and a Game-Changing Space Telescope Aug 30, 2026

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The Nancy Grace Roman Space Telescope sees 100 times more sky than the Hubble Space Telescope and has the ability to directly image planets around other stars like those in our own solar system. Learn about this game-changing space telescope as well as new take on old Hubble observations that allows dark matter to be mapped on a finer scale than ever before.

Black Hole Stars and Solar Instabilities Aug 23, 2026

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What do you call a very-but-not-so-supermassive black hole completely encased in a warm dense cloud of hydrogen? A hot mess? How about "black hole star", a new category of crazy astronomical object that can explain some of the James Webb Space Telescope's mysterious findings from the early universe. And we're a step closer to understanding our own star with dazzling data from the Inouye Solar Telescope that shows evidence of a fluid instability at the surface that helps explain how the solar corona gets so hot. Join us for this, space news, sci fi trivia and more.

Dyson Spheres and Interstellar Colonization Aug 16, 2026

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Strange and Top are at it again with a deep dive on the physics, psychology, and philosophy of the big questions: is there technologically advanced life out there in the galaxy, and if so, we will ever know? Will we make it out of the solar system, and if so, what would that look like? Join us for all that and a physics question disguized as a trivia question.

Black Holes Come Back for Seconds and a Rocky Exoplanet with an Atmosphere Aug 11, 2026

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Supermassive have such voracious appetites that they create an energetic mess when eating which has a tendency to shoot their food off at very high speeds. New observations show the second course for these monsters as material falls back into them. A rocky exoplanet in the habitable zone has a confirmed atmosphere, checking another box for finding worlds that may have life. Join us for a whimsical tour of the universe on Walkabout the Galaxy.

Distant Quasars and Earth's Quasi-Moon Jul 09, 2026

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Quasars, the energetic engines driven by the voracious appetite of supermassive black holes, have been observed in the very early universe, upending ideas about how long it took to form these behemoths in the first place. New results on a peculiar object tagging along around the Sun with the Earth casts doubt on its origin as a possible fragment of the Moon. And the climate takes a swipe at strange quark for complaining about the heat. Check it all out, plus trivia and space news, on Walkabout the Galaxy.

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