The 365 Days of Astronomy

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Astronomy
**The 365 Days of Astronomy**

The 365 Days of Astronomy podcast launched in 2009 as part of the International Year of Astronomy. This community podcast continues to bring you day after day of content across the years. Everyday, a new voice, helping you see the universe we share in a new way. This show is managed by Avivah Yamani, edited by Richard Drumm. This podcast is funded through Patreon.com/CosmoQuestX and produced out of the Planetary Science Institute.

Latest Episodes:

Astronomy Cast Ep. 787: Evolved Stars (They're not dead yet!) Mar 23, 2026

Show notes

https://www.youtube.com/watch?v=jY1_q9a0UFc

Hosted by: Fraser Cain ( @frasercain ) and Dr. Pamela L. Gay ( @CosmoQuest )

Streamed live on Mar 16, 2026.

Main sequence stars spend most of their time being… normal. Fusing hydrogen into helium in their cores. Producing radiation. But as their stockpiles of hydrogen run out they switch to other fuels, starting to climb the ladder of the periodic table of elements. And this is when things get weird. As we get more and more observations of the cosmos, our understanding gets more detailed. In this episode we look at all the ways a star can die and the updates that we've learned in the past 20 years of Astronomy Cast.

Image Credit: NASA Galex

This show is supported through people like you on Patreon.com/AstronomyCast

In this episode, we'd like to thank: Burry Gowen, Eric Lee, Jeanette Wink, Michael Purcell, Andrew Poelstra, David, David Rossetter, Ed, Gerhard Schwarzer, Jason Kwong, Joe McTee, Sergey Manouilov, Siggi Kemmler, Sergio Sancevero

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. 865 & 866: New Potentially Hazardous Asteroid & Interstellar Visitor Mar 22, 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 September 2025.

Today's 2 topics:

- On a short June night my Catalina Sky Survey teammate Greg Leonard was observing with our 60 inch telescope on Mt. Lemmon, Arizona in the constellation of Ursa Major when a relatively bright fast moving point of light appeared in a set of his images. Even though on its current path Greg's discovery, 2025 MM89, has virtually no chance of impacting our home planet asteroid hunters will continue to track it to make sure it doesn't become a threat as it passes other objects in space.

- Amazingly, nature occasionally sends an interstellar traveler through our solar system for us to observe. The third such object that astronomers have discovered coming into our solar system from truly deep space is 3I/ATLAS. It was discovered as it streaked towards the inner solar system at 130,000 miles per hour by the ATLAS team's 20 inch telescope in Chile and was quickly tracked by telescope around the world.

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.

ASTROMAN - Light Pollution and the Fight to Bring Back the Stars Mar 21, 2026

Show notes

In this episode of Dark Sky Guardian, we learn how thoughtful lighting can reduce glare, save energy, protect wildlife, and restore our connection to the night sky.

"ASTROMAN: the Dark Sky Guardian" is a podcast channel that aims to explore popular science in multiple disciplines and research on interdisciplinary approaches, such as sustainability, dark-sky protection, astrophotography, space exploration, astronomy innovation, inclusive science communication, and STEAM Education by integrating science and arts.

Exodus CL Sit, also known as the ASTROMAN, is a transmedia astronomy educator, popular science author, STEAM educator, and science communicator in Hong Kong. He is recently the National Astronomy Education Coordinator (Chair of Hong Kong, China) of the International Astronomical Union and President of Starrix. He was also an International Committee Member of the Dark Sky International, regularly organizing public lectures at the Hong Kong Space Museum and the Hong Kong Science Museum. He was also the author of a popular science book "Decoding the Starry Night: A Guide to Stargazing and Astrophotography".

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 - Daily Space Planets, Stars & Death to Dark Energy Mar 20, 2026

Show notes

https://cosmoquest.org/x/dailyspace/2020/01/07/planets-stars-and-death-to-dark-energy/

From January 7, 2020.

The Hubble Space Telescope continues to give us amazing views and science, 30 years later. Here are a couple of new stories that help us appreciate this amazing tool of science.

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.

Actual Astronomy - A Listener's Dream Observatory Mar 19, 2026

Show notes

Hosted by Chris Beckett & Shane Ludtke, two amateur astronomers in Saskatchewan who enjoy teaching astronomy classes and showing the public views through their telescopes. actualastronomy@gmail.com

A listener builds their dream observatory on Episode 529 of the Actual Astronomy podcast. I'm Chris and joining me is Shane. We are amateur astronomers who love looking up at the night sky and this podcast is for everyone who enjoys going out under the stars.

We have a special guest joining us today, listener Kevin Duchscherer is joining us to share his Observatory Progress.

- Where are you located Kevin?

- How long have you been a listener?

- Tell us about how you became interested in astronomy

- What sort of astronomy do you enjoy? Visual? astro-Imaging? Both?

- What equipment have you owned?

- What equipment is in or will go into the observatory?

- What was your path to building an observatory

- Tell us about the design & construction but please start with the footprint size for both the observing area and warm room! Wall & pier height? How did you determine that?

- How did you isolate piers?

- I note the warm room is south?

- What sort of rolling mechanism/rollers?

- Is the roof powered?

- I note you insulated? So will you climate control / AC in summer?

- Plans for use and;

- There was something vaguely familiar, I note some of the features from "A Crayford Type Observatory" https://crayfordmanorastro.com/2019/02/11/a-crayford-type-roll-off-roof-observatory/

- Next steps

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.

Cheap Astronomy - Dear CA 131: What's The Point? Mar 18, 2026

Show notes

Hosted by Steve Nerlich.

Cheap Astronomy asks what's the point and then gets some sunshine.

Dear Cheap Astronomy – Did the Universe start from a single point?

This hypothetical concept is commonly stated in pop science blogs and we are guilty of doing the same here at Cheap Astronomy. However, it's not necessarily correct. As with most things relating to the Universe, all we can really talk about is the observable Universe. All evidence available does suggest that it emerged from a point source 13.8 billion years ago, but if the actual Universe is bigger than the observable Universe – and it very likely is – then it's not clear that the whole Universe emerged from that point source.

Dear Cheap Astronomy – Is space-based solar power the solution to all our problems?

Well, not all our problems and while SBSP is technically feasible, it may not be economically viable. The general idea of SBSP is that you have a solar collecting facility in Earth orbit, which then transmits the energy collected as microwaves down to the Earth's surface. Microwaves are preferred since they pass through the Earth's atmosphere relatively well and should not harm aircraft, ground infrastructure or people if they happen to get in the way. It might seem a bit daft to intercept light that already passes through the Earth's atmosphere, convert it into a lower energy form of light and then pass that through the atmosphere.

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. 268: What are Little Red Dots? Mar 17, 2026

Show notes

Hosted by Dr. Paul M. Sutter.

What do we find when we push the James Webb Space Telescope to its limits? Are Little Red Dots newborn galaxies or old black holes? What are they teaching us about the early Universe? 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, 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, Allen E, Michael S, Reinaldo A, Sheryl, David W, Chris, Michael S, Erlend A, James D, Karl W, Den K, Edward K, Scott K, Vivek D, Jennifer D, Barbara C, Brad, Azra K, Steve R, Koen G, Scott N, and M D Malahy!

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 Ep. 786: Wolf-Rayet Stars Mar 16, 2026

Show notes

https://www.youtube.com/watch?v=g_Y-ST_az9c

Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)

Streamed live on Mar 9, 2026.

You think the Sun is a terrifying ball of fire and fury? Wait until you learn about today's topic: Wolf-Rayet stars! These are massive, dying stars hurling their outer layers out into space before detonating as supernovae. Big stars live brief lives, and Wolf-Rayet stars are the punctuation mark we see before things go supernova.

Image Credit: NASA, ESA, CSA, STScI; Science: Yinuo Han (Caltech), Ryan White (Macquarie University); Image Processing: Alyssa Pagan (STScI) Learn more here: https://science.nasa.gov/asset/webb/w...

This show is supported through people like you on Patreon.com/AstronomyCast

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. 863 & 864: Space Elevator & Lunar Debris Mar 15, 2026

Show notes

From August 2025.

Today's 2 topics:

- In a recent study Dr. Lynnane George and her co-authors investigate Space Elevator technology to remove materials from Ceres and deliver them to orbital depots around the solar system. The tiny gravity of Ceres, nano-fiber technology, and different water propulsion systems are utilized by Dr. George and her team to construct theoretically possible systems which would extract raw materials from Ceres and deliver them to low Earth orbit and other locations within the solar system. These researchers estimate such a transport system could reduce fuel costs by up to 60% compared to transport from the Earth's surface.

- Asteroid 2024 YR4 will not hit the Earth in 2032, has a 4% chance of hitting the Moon, and most likely will pass within 900 miles of the lunar surface. If 2024 YR4 were to impact the Moon it could send about the mass of several small cargo ships into space with lunar escape velocity and could pose a threat to our satellites. [Editor's note: Using JWST data, it's just been calculated to miss the Moon, unfortunately. Maybe next time…]

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.

NOIRLab - Results From Six Years of the Dark Energy Survey Mar 14, 2026

Show notes

The Dark Energy Survey Collaboration collected information on hundreds of millions of galaxies across the Universe using the U.S. Department of Energy-fabricated Dark Energy Camera, mounted on the U.S. National Science Foundation Víctor M. Blanco 4-meter Telescope at CTIO, a Program of NSF NOIRLab. Their completed analysis combines all six years of data for the first time and yields constraints on the Universe's expansion history that are twice as tight as past analyses. In this podcast, Dr. Yuanyuan Zhang discusses the Dark Energy Survey results and how they inform the next steps in dark energy research.

Bios:

Rob Sparks is in the Communications, Education and Engagement group at NSF's NOIRLab in Tucson, Arizona.

Dr. Yuanyuan Zhang is an Assistant Astronomer at NSF's NOIRLab. Her research interest is on galaxy clusters and large scale structures. She is heavily involved in the Dark Energy Survey (DES) and the LSST Dark Energy Science Collaborations.

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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