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Walkabout the Galaxy

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Rating
★★★★★
4.8
from
117 reviews
This podcast has
375 episodes
Language
English
Date created
2014/04/22
Latest episode
2026/09/26
Average duration
43 min.
Release period
16 days

Description

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

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Check latest episodes from Walkabout the Galaxy podcast


Backwards Exoplanet and Shrinking Mercury
2026/09/26
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?
2026/09/15
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
2026/08/30
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
2026/08/23
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
2026/08/16
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
2026/08/11
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
2026/07/09
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.
I See a Big Moon Rising and a Bright Radio Sky
2026/07/01
The astroquarks examine the oft-asked question of why the Moon sometimes looks huge and other times, not so much, and we take a look at the cool mission to grapple and boost the NASA Swift space telescope into a higher orbit. Plus, new observations reveal that the sky is much brighter at radio wavelengths than previously assumed, teaching us something about the population of free electrons. Join us for all this, space trivia, and more.
Europa's Disappearing Plumes
2026/06/25
OG Top Quark Tracy Becker joins us with an update on water plumes from Jupiter's moon Europa, plus intriguing new data of interstellar comet 3I shows it is even older than we thought, with an age approaching that of the Milky Way galaxy itself. A new field of tektites has been discovered, pointing to a previously unknown major impact on the Earth. Join us for all this, space news, trivia and more.
Second Generation Black Hole Mergers and Solar System Chaos
2026/06/04
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.
Whacky Black Hole Collisions and Strange Uranian Rings
2026/05/20
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!
Little Plutino Has An Atmosphere and Making Sense of Saturn
2026/05/13
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.
Superkilonova and Artemis II Recap
2026/04/28
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!
A Whisper of a Hint of Primordial Black Holes plus Earth BLOBs
2026/03/18
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.
Supermassive Black Holes Supersoaking Other Galaxies
2026/02/25
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.

Podcast reviews

Read Walkabout the Galaxy podcast reviews


4.8 out of 5
117 reviews
★★★★★
Non-Quark 2025/08/17
HOT TAKE!
The takes are indeed hot.
★★★★★
Dave of Det 2025/04/04
Keep it up
The podcast is good, but I’m really intrigued by Josh’s point of view and enjoy how he breaks everything down for undereducated folks such as myself t...
★★★★★
mr foo 2024/10/11
Informative and fun at the same time
I can't say I have come across many science podcasts that are both informative and fun -- amazingly this podcast does both and makes me feel connected...
★★★★★
NikolaiGranakov 2024/04/03
Great science podcast!
I look forward to this every week, it’s one of my favorites. Jim is hilarious!
★★★★★
S-DUBB 2021/12/31
Is Jim the best or is it just me?
This is the best podcast of its kind. Hands down.
★★★★★
spoitfy rocks 2021/09/25
Awesome and easy to understand
This crew makes it simple to understand complex concepts. Highly recommend for anyone interested in space and science
★★★★★
EvoEvove 2021/05/20
I couldn't delete it
I haven't been listening to podcasts during the pandemic times as much as I used to, when they helped me through rush hour traffic. I had over 2,000 ...
★★★★★
OG DOOGLEHOWSER 2021/02/11
Entertaining and informative
Been listening since almost the beginning. Very entertaining and informative. Love the three hosts’ chemistry. I usually get bored and move on to anot...
★★★★★
AK JDW 2021/02/03
JD Wall
Great topics. Jim is really good at explaining complex ideas. Trivia is fun
★★★★★
musictycoon 2021/02/02
Fun and quirky
Super great podcast. I appreciate the level of detail they go into for certain stories. An appropriate level for intro students and professionals alik...
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