Rephonic
Artwork for Walkabout the Galaxy
Mars
Dark Matter
NASA
Asteroids
Black Holes
Exoplanets
James Webb Space Telescope
Venus
Astronomy
Supermassive Black Holes
Milky Way
Saturn
Astrophysics
Enceladus
Spacex
Dark Energy
Artemis II
Supernovae
Active Asteroids
Primordial Black Holes

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

PublishesTwice monthlyEpisodes377Founded12 years ago
Number of ListenersCategories
Natural SciencesComedyScience

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Artwork for Walkabout the Galaxy

Latest Episodes

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... more

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... more

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 ... more

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 Telesc... more

Key Facts

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Recent Guests

Charm Quirk
Guest commentator on space news and hot takes
Unspecified
Episode: Second Generation Black Hole Mergers and Solar System Chaos
Audrey Warren
Guest on episode discussing Plutinos and atmospheres
Walkabout the Galaxy
Episode: Little Plutino Has An Atmosphere and Making Sense of Saturn
Jeff Kluger
Editor-at-large for Time Magazine and author of Gemini, Stepping Stone to the Moon
Time Magazine
Episode: The Amazing and Crazy Story of Gemini and Jumbo Black Holes
Trina Ray
Planetary scientist at Jet Propulsion Laboratory
Jet Propulsion Laboratory
Episode: Europa Clipper Report from Mars and ATLAS 3I Update from DragonCon 2025
Brendan Byrne
Friend of the show and host of Are We There Yet?
Are We There Yet?
Episode: Interstellar Comet 3I/ATLAS is Out Of This World
Tracy Becker
Astrophysicist and member of Europa Clipper mission team, formerly a graduate student at UCF
NASA
Episode: OG Top Goes to Europa
Cady Coleman
PhD chemist, retired US Air Force Colonel, former NASA astronaut, and author
Episode: Adventures in Space the Cady Way
Dr. Erika Nesvold
Astrophysicist and author of Off Earth, Ethical Questions and Quandaries for Living in Outer Space.
Author
Episode: Ethical Dilemmas in Space Exploration

Hosts

Josh Caldwell
Regular host with a strong presence across episodes featuring space news, exoplanets, and scientific commentary.
Jim Cooney
Co-host known for humor and deep dives into astronomy topics and space science storytelling.
Addie Dove
Co-host contributing practical insights and a warm, accessible hosting style.
Audrey Martin
Co-host bringing science background and engaging banter to space topics and news.

Reviews

4.7 out of 5 stars from 264 ratings
  • HOT TAKE!

    The takes are indeed hot.

    Apple Podcasts
    5
    Non-Quark
    United Statesa year ago
  • 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 to understand.

    Go science! And keep up the good work!

    Apple Podcasts
    5
    Dave of Det
    United States2 years ago
  • 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 to important developments in astronomy.

    Apple Podcasts
    5
    mr foo
    United States2 years ago
  • Great science podcast!

    I look forward to this every week, it’s one of my favorites. Jim is hilarious!

    Apple Podcasts
    5
    NikolaiGranakov
    United States3 years ago
  • 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.

    Apple Podcasts
    5
    mr foo
    United States3 years ago

Listeners Say

Key themes from listener reviews, highlighting what works and what could be improved about the show.

Strong chemistry among hosts is frequently highlighted as a key strength.
Fans appreciate deep-dive topics balanced with humor and trivia.
Listeners praise accessible, entertaining science explanations.

Chart Rankings

How this podcast ranks in the Apple Podcasts, Spotify and YouTube charts.

Talking Points

Recent interactions between the hosts and their guests.

Europa Clipper Report from Mars and ATLAS 3I Update from DragonCon 2025
Q: What is the trivia question related to the 404 error code?
The trivia primarily relates to the April error code 404 and its origins, examining aspects of its assignment, significance at CERN and relation to software.
Interstellar Comet 3I/ATLAS is Out Of This World
Q: What do you think about the interstellar comet 3I/ATLAS?
3I/ATLAS appears to be much larger than other known interstellar objects and is expected to come very close to the sun, offering an exciting opportunity for scientific observation.
Vera Rubin Observatory Sets Sights on the Universe
Q: What does the Vera Rubin Observatory aim to achieve?
It aims to discover a large number of asteroids and improve knowledge about dark matter and dark energy over the course of its survey.
Vera Rubin Observatory Sets Sights on the Universe
Q: What one thing would you love, like the most spectacular, amazing thing to see, if you could?
Tracy would like to see an actual picture of an event horizon around a supermassive black hole to help understand astrophysics.
A Slurping Black Hole and a Win for the Streaming Instability
Q: How long after the last human dies, assuming it's tomorrow, will the last artificial light go out?
It is about 100 years for typical artificial lights, depending on how they are powered and assuming power supply does not continue.

Audience Metrics

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Frequently Asked Questions About Walkabout the Galaxy

What is Walkabout the Galaxy about and what kind of topics does it cover?

A witty, astronomy-focused show that blends accessible explanations of space news with playful banter among a core group of regulars. Episodes cover exoplanets, black holes, JWST findings, Artemis missions, and other frontier topics, all delivered with curiosity, humor, and peer-level expertise. The format often includes light sponsor reads and banter that fans describe as warm, nerdy, and engaging, making complex science approachable for both enthusiasts and professionals. The show is notable for its chemistry among hosts, the balance of data-rich content with entertaining anecdotes, and its knack for turning deep space topics into casual conversations that still feel informative and credible.

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How many listeners does Walkabout the Galaxy get?

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To see how many followers or subscribers Walkabout the Galaxy has on Spotify and other platforms such as Castbox and Podcast Addict, simply upgrade your account. You'll also find viewership figures for their YouTube channel if they have one.

Which podcasts are similar to Walkabout the Galaxy?

These podcasts share a similar audience with Walkabout the Galaxy:

1. Planetary Radio: Space Exploration, Astronomy and Science
2. Space Nuts: Astronomy Insights & Cosmic Discoveries
3. Astronomy Cast
4. Universe Today Podcast
5. Why This Universe?

How many episodes of Walkabout the Galaxy are there?

Walkabout the Galaxy launched 12 years ago and published 377 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.

How do I contact Walkabout the Galaxy?

Our systems regularly scour the web to find email addresses and social media links for this podcast. We scanned the web and collated all of the contact information that we could find in our podcast database. But in the unlikely event that you can't find what you're looking for, our concierge service lets you request our research team to source better contacts for you.

Where can I see ratings and reviews for Walkabout the Galaxy?

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What guests have appeared on Walkabout the Galaxy?

Recent guests on Walkabout the Galaxy include:

1. Charm Quirk
2. Audrey Warren
3. Jeff Kluger
4. Trina Ray
5. Brendan Byrne
6. Tracy Becker
7. Cady Coleman
8. Dr. Erika Nesvold

To view more recent guests and their details, simply upgrade your Rephonic account. You'll also get access to a typical guest profile to help you decide if the show is worth pitching.

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