The 365 Days of Astronomy

Latest Episodes:

Awesome Astronomy - 3 Days to Lose LEO Jan 28, 2026

Show notes

Paul Hill and Dr. Jenifer "Dr. Dust" Millard host.

Damien Phillips, John Wildridge and Dustin Ruoff produce.

So it looks like Low Earth Orbit is not just crowded but a disaster waiting to happen trapping humanity on this planet for a very long time…

https://www.esa.int/Space_Safety/Space_Debris/Space_debris_by_the_numbers

https://arxiv.org/abs/2512.09643

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------------------------------------

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------------------------------------

The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

Cheap Astronomy - Dear CA #128: Persistent Claims Jan 27, 2026

Show notes

Still looking.

Hosted by Steve Nerlich.

Dear Cheap Astronomy – Is there anything new on Planet 9?

Well, not really and there is some growing skepticism about whether it's really there. Nonetheless, its original proponents, Mike Brown and Konstantin Batygin, still stick to their guns on the matter, though both agree Planet 9's existence must be considered speculative until it is actually observed.

Dear Cheap Astronomy – Is Nemesis really out there?

Continuing the theme of hypothetical solar system bodies, Nemesis was proposed to be a small, dim and hence difficult to spot companion star of the Sun. Its existence was proposed in 1984 on the basis of a perceived 27 million year cycle in mass extinction events, where anything cyclical gets people thinking about orbits – and with a 27-million-year periodicity, you need a pretty big orbit.

We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.

Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!

Share the podcast with your friends and send the Patreon link to them too!

Every bit helps! Thank you!

------------------------------------

Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!

http://cosmoquest.org/Donate This show is made possible through your donations.

Thank you! (Haven't donated? It's not too late! Just click!)

------------------------------------

The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

Astronomy Cast - Questions: Relativity, Relativity & More Relativity Jan 26, 2026

Show notes

From October 23, 2008.

Hosted by Fraser Cain & Dr. Pamela Gay.

Everyone loves a theme. And this week we've collected together some of your questions about relativity. More light speed spacecraft, twin paradoxes, and the mixing up of gravity, time and mass. If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

- What would happen if you're traveling close to light speed through the solar system — would you mess it up?

- If I watched my friend accelerate close to speed of light, will I see him get younger or age slower?

- Can parts of the Universe be traveling back in time?

- What form does relativistic mass increase take?

- Why don't photons have mass?

- Twin paradox: Why is the "stay at home" twin's frame of reference preferred?

- Does gravity equal time?

- How can the state of an electromagnetic wave change when the wave exists outside of time?

- How do we know the speed of light constant? Could it be different in different part of the universe?

We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.

Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!

Share the podcast with your friends and send the Patreon link to them too!

Every bit helps! Thank you!

------------------------------------

Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!

http://cosmoquest.org/Donate This show is made possible through your donations.

Thank you! (Haven't donated? It's not too late! Just click!)

------------------------------------

The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

Travelers in the Night Eps. 849 & 850: Europa Clipper & Who Owns A Space Rock? Jan 25, 2026

Show notes

Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org

From May, 2025.

Today's 2 topics:

- NASA's Europa Clipper was launched October 14, 2024 on a mission to conduct a detailed study of Jupiter's Moon Europa. The space craft will travel some 1.8 billion miles and should reach Jupiter in April 2030. This mission will begin to tell us if life as we know it can occur relatively close to home.

- Since there is a world wide market for meteorites some of which can be sold on line, for millions of dollars, the question of ownership becomes important.

We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.

Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!

Share the podcast with your friends and send the Patreon link to them too!

Every bit helps! Thank you!

------------------------------------

Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!

http://cosmoquest.org/Donate This show is made possible through your donations.

Thank you! (Haven't donated? It's not too late! Just click!)

------------------------------------

The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

Cosmic Savannah Ep 78: Back Under the Stars - A New Dawn Jan 24, 2026

Show notes

Hosted by Dr. Jacinta Delhaize, Dr. Tshiamiso Makwela, Dr. Daniel Cunnama & François Campher.

At long last…we're back!!! The Cosmic Savannah is entering an exciting new era as we transition into a video podcast! In this episode, we kick off that journey and invite you to join us as we venture even deeper into the cosmic ocean—exploring the universe, sharing new perspectives, and connecting with the people who bring astronomy to life. Exciting times lie ahead, and we're thrilled to have you along for the ride.

In this episode, the team also reflects on the past 12 months, and in particular on the International Astronomical Union's General Assembly – a massive astronomy conference that was held in Cape Town one year ago. The Cosmic Savannah intern Kaashifa Saloojee makes her microphone debut as she speaks with special guest Kevin Govender. Kevin was the Chair of the IAU GA National Organising Committee and is the Director of the Office of Astronomy for Development (OAD), based in Cape Town.

With a background in Nuclear Physics, Kevin first became involved in astronomy in 2006 when he managed the Collateral Benefits Programme at the South African Astronomical Observatory (SAAO). This work ultimately led to his appointment as the inaugural Director of the OAD in 2011.

We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.

Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!

Share the podcast with your friends and send the Patreon link to them too!

Every bit helps! Thank you!

------------------------------------

Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!

http://cosmoquest.org/Donate This show is made possible through your donations.

Thank you! (Haven't donated? It's not too late! Just click!)

------------------------------------

The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

EVSN - Martian Volcanoes Once Chose Violence Jan 23, 2026

Show notes

From April 28, 2022.

An analysis of images taken by the Spirit rover of olivine-rich rocks in Gusev crater has revealed a much more violent volcanic origin than originally thought and one that likely occurred early in Mars's history. Plus, balloon science, more Mars, more volcanoes, pretty Hubble images, and What's Up (a supernova!).

We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.

Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!

Share the podcast with your friends and send the Patreon link to them too!

Every bit helps! Thank you!

------------------------------------

Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!

http://cosmoquest.org/Donate This show is made possible through your donations.

Thank you! (Haven't donated? It's not too late! Just click!)

------------------------------------

The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

Space Scoop - A Thrilling Radio Message From A Nearby Red Star Jan 22, 2026

Show notes

https://spacescoop.org/en/scoops/2529/a-thrilling-radio-message-from-a-nearby-red-star/

Hosted by our editor, Richard Drumm.

About 130 light-years away from Earth there's an early M-Dwarf star called StKM 1-1262.

Let's call it 1262… It's actually a common, ordinary star, the most common of stars, in fact. It's a red dwarf! They're also called 'Flare Stars' because they flare up frequently. Tempestuous little buggers! Not long ago astronomers got an exciting radio message of a sort from this star.

What did the message say? Just listen!

We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.

Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!

Share the podcast with your friends and send the Patreon link to them too!

Every bit helps! Thank you!

------------------------------------

Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!

http://cosmoquest.org/Donate This show is made possible through your donations.

Thank you! (Haven't donated? It's not too late! Just click!)

------------------------------------

The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

Awesome Astronomy - Panto 2025: Cometh the Comet, Comet the Ralph Jan 21, 2026

Show notes

Paul Hill, Ralph Wilkins and Dr. Jenifer "Dr. Dust" Millard host.

Damien Phillips, John Wildridge and Dustin Ruoff produce.

It's time for our annual review of the year, a look forward to next year and of course the Panto!…and the return of an old face!

We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.

Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!

Share the podcast with your friends and send the Patreon link to them too!

Every bit helps! Thank you!

------------------------------------

Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!

http://cosmoquest.org/Donate This show is made possible through your donations.

Thank you! (Haven't donated? It's not too late! Just click!)

------------------------------------

The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

Ask A Spaceman Ep. 264: Just How Weird is the Quantum Eraser? Jan 20, 2026

Show notes

Hosted by Dr. Paul M. Sutter.

How does the double-slit experiment work? What does it teach us about reality and measurement if we try to mess with the experiment after it's already started? How does quantum complementarity guide us with how to think about it? I discuss these questions and more in today's Ask a Spaceman!

Support the show: http://www.patreon.com/pmsutter

All episodes: http://www.AskASpaceman.com

Watch on YouTube: http://www.youtube.com/PaulMSutter

Read a book: https://www.pmsutter.com/books

Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE!

Big thanks to my top Patreon supporters this month: Justin G, Chris L, Alberto M, Duncan M, Corey D, Michael P, Naila, Sam R, Joshua, Scott M, Rob H, Scott M, Louis M, John W, Alexis, Gilbert M, Rob W, Jessica M, Jules R, Jim L, David S, Scott R, Heather, Mike S, Pete H, Steve S, Lisa R, Kevin B, Aileen G, Steven W, Deb A, Michael J, Phillip L, Steven B, Mark R, Alan B, Craig B, Richard K, Stephen J, Joe R, David P, Justin, Tracy F, Ella F, Thomas K, James C, Syamkumar M, Homer V, Mark D, Bruce A, Tim Z, Linda C, The Tired Jedi, Bob C, Stephen A, James R, Robert O, Allen E, Michael S, Reinaldo A, Sheryl, David W, Chris, Michael S, Erlend A, James D, Larry D, Karl W, Den K, Edward K, Craig M, Scott K, Vivek D, Barbara C, Brad, Azra K, Steve R, Koen G, and Scott N!

We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.

Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can!

Share the podcast with your friends and send the Patreon link to them too!

Every bit helps! Thank you!

------------------------------------

Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!

http://cosmoquest.org/Donate This show is made possible through your donations.

Thank you! (Haven't donated? It's not too late! Just click!)

------------------------------------

The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.

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