The 365 Days of Astronomy

Strange Skies!

Hosted by Dr. Paul M. Sutter.

What are UFOs? What are the chances that aliens have visited the Earth? Why should we bother talking about it? I discuss these questions and more in today's Ask a Spaceman!

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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, 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, Michael J, Phillip L, Steven B, Mark R, Alan B, Craig B, Richard K, Joe R, David P, Justin, Tracy F, Thomas K, James C, Syamkumar M, Mark D, Bruce A, Tim Z, Linda C, The Tired Jedi, Bob C, Stephen A, James R, Allen E, Michael S, Sheryl, David W, Chris, Michael S, Erlend A, James D, Karl W, Edward K, Scott K, Vivek D, M0PPET, Brad, Azra K, Steve R, M D Malahy, Brian O, Alonna M, Joseph B, Anders J, Blaine, Ry Guy, and Phil!

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

https://www.youtube.com/watch?v=NUAmf_p-FKU

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

Streamed live on Oct 27, 2026.

The majority of rockets use a chemical propulsion system, but there are other ideas, fancy ideas that sound like they came from science fiction. But they're real and they work! Today we'll talk about ion engines, used by tie fighters everywhere!

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

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. http://travelersinthenight.org

From May, 2026.

Today's 2 topics:

- Recently my Catalina Sky Survey teammate Rose Matheny discovered 8 new Earth approaching object candidates on a single night with our Schmidt telescope on Mt. Bigelow, Arizona. One of them, 2017 YO is a mile and a half diameter, main belt asteroid, while the other 7 are interesting Earth approaching objects. Another one of Rose's single night discoveries is 2017 YM1. When Rose first spotted it this space rock was moving rapidly north, at 6.9 miles per second, away from the Earth in the constellation of Ursae Major. About 5 days earlier it had passed near both the Earth and Our Moon at which time it was too far south to be seen from Arizona.

- Often observers report hearing a percussive sound, like a sonic boom from an aircraft, minutes after viewing a bright meteor fireball. In addition, in a fewer number of instances, there are many reliable reports of observers hearing popping, hissing, and rustling sounds at the same time they are observing a very bright meteor traveling though the night sky. Professional astronomers have long dismissed these reports saying that what these people hear simultaneously with their visual observations cannot be due to to sound traveling from the meteors path since sound travels 800,000 times slower than light and would take 1.5 to 4 minutes to traverse the distance that the light does in a tiny fraction of a second.

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

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

https://www.youtube.com/watch?v=B9P_8oZ4rCA

Hosted and recorded by: Fraser Cain (@frasercain)

From Oct 23, 2026.

The Japanese mission is off to Phobos. Heck, to Deimos too! And, actually, there are green stars. Lots of colors to choose from! You want purple? We got purple!

Also: Dark matter interacts with dark matter, a mysterious Martian cloud, Euclid discovers a comet, the Milky Way's disc, a mini-mini quasar, NGC 7129 & Seagull nebula (SH 2-292) photos, Patreon question answered!

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

Hosted by: Dr. Pamela L. Gay (@CosmoQuest)

From July 2, 2020.

Join us today as we talk about the first exposed planetary core ever discovered. We examine research that neutrinos may come from supermassive black holes. We look at the filaments found in the halo of galaxy cluster Abell 2255. And we find out that LIGO's mirrors can vibrate due to quantum noise.

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

https://www.youtube.com/live/H0qVigc9gnQ

Hosted by: Dr. Pamela L. Gay (@CosmoQuest)

Book Talk with Dr. Kimberly K. Arcand & Megan Watzke.

Streamed live on Feb 6, 2026.

When some of our favorite people have a new book on one of our favorite topics, you know we have to have them on! We are super pleased to be joined by Dr. Kimberly K. Arcand and Megan Watzke who discuss their new book "Why Space Will Freak You Out" (Amazon Affiliate Link: https://amzn.to/4rzGtXw ). This colorful book, which mixes illustrations and observations of our Universe, launches February 10. Join us to learn how they picked their targets, and why you should and should not fear our universe.

We are grateful for your support on http://Patreon.com/CosmoQuestX

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

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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.

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

Written & hosted by our Director, Avivah Yamani.

Why do astronomers call oxygen and carbon metals? Explore how stars created the elements that formed planets, and eventually, us!

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

Hosted by Steve Nerlich.

Who knew?

Dear Cheap Astronomy – Do gravitons exist?

Once again we're dealing with something hypothetical here – so much like virtual particle pairs that pop out of nowhere and can evaporate black holes, it's entirely possible that gravitons exist, but at this time it's probably appropriate to entertain the notion that they might not exist either. Ten years ago we would have said the same thing about the Higgs boson, but that was positively identified by the Large Hadron Collider in 2012 and hence moved from being a hypothetical to a real particle at that time.

Dear Cheap Astronomy – Is the Universe full of explosions?

Well, yes it does seem that way. There are the various classes of novae, but also bursts of various kinds, ranging from radio to gamma ray bursts. They've traditionally been classified separately although the boundaries of those classifications often blur. The word nova means new – arising from the fact that when they happen a star may become visible due to a sudden transient brightening. A standard nova arises from binary systems in which one star is a white dwarf that gravitationally draws material off its binary companion star which is a red giant.

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

https://www.youtube.com/watch?v=rK6w8ZHm8UM

Streamed live 18 Oct 2026.

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

Today we continue looking at space exploration technologies. This time we will examine thrusters, which can reorient a spacecraft and help it maneuver in space. Maximum flexibility but you need to bring along some propellant.

Smarter Every Day's YouTube video:

I Was SCARED To Say This To NASA... (But I said it anyway)

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

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

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

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

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

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. http://travelersinthenight.org

From May 2026.

Today's 2 topics:

- Winter nights can be exhausting, productive, as well as sometimes frustrating for asteroid hunters. At the Sixty Inch Telescope on Mt. Lemmon, Arizona, near winter solstice, the night's observing starts at 6:30 PM and continues till after 6 AM which combined with start up and end tasks makes the asteroid hunter's work "day" more than 13 hours long. On such a recent long winter work night, my Catalina Sky Survey Teammate, Carson Fuls discovered an impressing total of 18 new Earth approaching objects. On the other hand on the next 3 night shift, I was treated to one night which was clear followed by two nights which were dominated by the first big snow storm of the season. The best nights are clear, cold, and calm with asteroid images which are small intense points of light. Such a night is said to have good seeing.

- My Catalina Sky Survey teammate Greg Leonard was searching for Earth approaching objects with our 60 inch telescope on Mt. Lemmon, Arizona when he discovered an interesting new comet moving through the constellation of Leo. After Greg posted his discovery observations on the Minor Planet Center's Near Earth Confirmation Page it was observed over the next 3 weeks by 10 different observatories around the world. These data were used to calculate the details of the new object's 51 year path around the Sun and give it the name Comet C/2017 W2 (Leonard).

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

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

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

Hosted by: Fraser Cain (@frasercain)

From Oct 4, 2016.

Black holes are the most impressive objects in the Universe, but when happens when they crash into each other is absolutely mind-bending. They distort space and time itself, sending ripples out into the Universe.

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

From October 21, 2026.

Hosted by Dr. Pamela L. Gay (@CosmoQuest)

This week we look at the weird results in space science. From looking at how wildly different images from different IR telescopes can be colorized, to worlds colliding, to white dwarfs of unusual size, and even to Earth's crust on the move, the news was surprising and sometimes a tad bit horrifying. And we present all of it here.

NGC 7129 — The Flower Bud Nebula. Spitzer vs. Webb color palettes:

https://www.universetoday.com/articles/webb-captures-stars-in-the-early-stages-of-life-in-a-nearby-stellar-nursery

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

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

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

Hosted by Steve Nerlich.

A podcast of sorts… Cheap Astronomy gets organized!

Dear Cheap Astronomy – How are asteroids organized?

The large majority of asteroids in the solar system are in the asteroid belt between mars and Jupiter. There are maybe 1-2 million that are more than a kilometer in diameter and millions more that are smaller than that. Nonetheless there's a huge amount of space between mars and Jupiter so it's nothing like that bit in the Empire strikes back. If you stood one asteroid is unlikely you'd be able to see another one and the odds of successfully navigating it are about one to one.

Dear Cheap Astronomy – Are primordial black holes dark matter candidates?

Well yes, though they aren't only candidates around. To recap, a primordial black hole is a hypothetical object which originated in very primordial times – probably within the first second of the Universe. It is somewhat puzzling that when the Big Bang brought lots of mass-generating particles into existence within a very small volume and at an extremely high density, it didn't form a black hole then and there – which would have then been the end of the story. But not only did things with mass suddenly come to be, they were all flung outwards as well – though primarily moving within rapidly expanding spacetime rather than actually being flung. And so here we are.

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

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

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

October Part 2.

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

Damien Phillips, John Wildridge and Dustin Ruoff produce.

Jeni gives us the low down on the Nancy Grace Roman Space Telescope in the first talk of Fall AstroCamp 2026.

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

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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.

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

Light Up Empty Space!

Hosted by Dr. Paul M. Sutter.

How does the vacuum interact with light? Is it possible to use light to create something from nothing? And is "birefringence" a real word? I discuss these questions and more in today's Ask a Spaceman!

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

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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, 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, Michael J, Phillip L, Steven B, Mark R, Alan B, Craig B, Richard K, Joe R, David P, Justin, Tracy F, Thomas K, James C, Syamkumar M, Mark D, Bruce A, Tim Z, Linda C, The Tired Jedi, Bob C, Stephen A, James R, Allen E, Michael S, Sheryl, David W, Chris, Michael S, Erlend A, James D, Karl W, Edward K, Scott K, Vivek D, M0PPET, Brad, Azra K, Steve R, M D Malahy, Brian O, Alonna M, Joseph B, Anders J, Blaine, Ry Guy, and Phil!

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

https://www.youtube.com/watch?v=mcn6f_PE14o

Spinney things!

Streamed live 18 Oct 2026.

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

Our journey through space exploration technology continues! Today we look at the things that spin: gyros, reaction wheels, servos. Newton's laws are large and in charge today as spinning has a very useful benefit when you're in weightlessness! Today we are going to understand the nemesis of space exploration missions everywhere, get to the bottom of this, how these things works, why they fail, and maybe what's being done about it, or maybe not!

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

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

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

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. http://travelersinthenight.org

From April 2026.

Today's 2 topics:

- Recently my Catalina Sky Survey teammates Carson Fuls and Greg Lenoard discovered an Aten asteroid which orbits the Sun once every 272 days and on a path that crosses the orbits of Venus and Earth a number of times each year. Atens account for only about 6% of the Earth approaching asteroids that asteroid hunters discover. They are relatively dim and difficult to discover because they spend most of their time inside the Earth's orbit with their sunlit side facing away from us. For example Carson and Greg's newly discovered asteroid, 2017 WJ16, is bright enough for asteroid hunters to track for only about 50 nights every couple of years.

- Oumuamua is the asteroid that zipped by the Earth on a trajectory that started beyond our solar system in truly deep space. After rounding our Sun at 97,000 mi/hr this unusual space rock will continue onward into deep interstellar space. The fact that this reddish object's brightness changes by a factor of 10 every 7.3 hours has been interpreted as being due to an elongated rocket or cigar shape which reflects different amounts of sun light in our direction as it tumbles through space. This strange space rock appears to be about 730 feet long and about 100 feet wide.

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

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

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

Galileo turned the telescope skyward and transformed astronomy, revealing lunar mountains, sunspots, Jupiter's moons, and a Universe far larger than imagined.

"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 Chun-Long 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.

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

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

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

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

In this episode, we cover key visual observing highlights for Saturn, including prominent features like the Equatorial Band and Equatorial Zone visible in amateur telescope. We also look at historical transient phenomena, such as the massive, planet-encircling "Great White Spots" that erupt in the northern hemisphere roughly once every Saturnian year.

Alexio wrote:

Hi Chris and Shane,

I saw Saturn in your Observer's Calendar show notes. I'm an amateur astronomer in Mississauga, and thought you might enjoy a website I've built called Astrochron. Its Saturn model lets you move through past and future years and watch the rings open wide, narrow to almost edge-on, then open up again with the other face in view.

Here's Saturn:

https://astrochron.app/objects/saturn

Regards,

Alexio

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.

From November 2020.

The brightest kilonova ever was detected and challenges current gamma-ray burst models. Plus, the history of water on both Venus and Mars, how radioactive elements may help habitability, and a little-known mass extinction event here on Earth. But wait! There's more… new images of the Perseus Cluster, a recaptured 1960s rocket booster, the shortest measurement of time, a treasure trove of copies of Principia, and SpaceX is certified to launch Crew-1 this weekend.

Perseus Cluster pix:

https://www.sci.news/astronomy/perseus-galaxy-cluster-radio-map-09213.html#google_vignette

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

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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 http://365DaysOfAstronomy.org/ or email us at info@365DaysOfAstronomy.org.