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.
Ask A Spaceman Ep. 283: What's Really Going on with UAPs?
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!
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...
Astronomy Cast Ep. 807: Mission Tech Series: Ion Drives
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!
We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.
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Travelers in the Night Eps. 389 & 390 Rose Rules Again & Meteor Whispers
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, 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...
Guide To Space - Space Bites: Phobos or Bust! & "Impossible" Green Stars Are In Fact Real
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!
We've added a new way to donate to 365 D...
EVSN - Exposed Planetary Core Discovered & LIGO Reveals "Spooky Popcorn"
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.
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...
Space Stories - Let's Look at the Weirdest Corners of Space!
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...
Space Stories - Astronomy Words: Metal
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!
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!
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Do go visit http://www...
Cheap Astronomy - Dear CA #142: Knowns & Unknowns
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...
Astronomy Cast Ep. 806: Mission Tech Series: Thrusters
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
...
Travelers in the Night Eps. 387 & 388: Long Winter Nights & Greg's Comet
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 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...
Guide To Space - What Happens When Black Holes Collide? Black Hole Mergers Across The Universe
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.
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 fr...
EVSN - Repainted Rose, Worlds Colliding & White Dwarfs of Unusual Size
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
We've added...
Cheap Astronomy - Dear CA #141: Sorting The Universe
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...
Awesome Astronomy - The Nancy Grace Roman Space Telescope
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.
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!
<...Ask A Spaceman Ep. 282: What Happens When You Shine a Light on Nothing?
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
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, as...
Astronomy Cast Ep. 805: Mission Tech Series - Gyroscopes & Servos
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...
Travelers in the Night Eps. 385 & 386: New Aten & Silent ET
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 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...
AstroMan - G Is For Galileo
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 re...
Actual Astronomy - Saturn at Opposition
Hosted by Chris Beckett & Shane Ludtke, two amateur astronomers in Saskatchewan who enjoy teaching astronomy classes and showing the public views through their telescopes. [email protected]
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 O...
EVSN - Luminous Kilonova Challenges Gamma-ray Burst Theories
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'v...
Guide To Space - Universe Today News: NASA Selects GIMLI to Search the Marius Lunar Pit for a Potential Lunar Base Site
https://www.universetoday.com/articles/nasa-selects-gimli-to-search-the-marius-lunar-pit-for-a-potential-lunar-base-site
Recorded by our editor, Richard Drumm.
Written by Matthew Williams.
Lava tubes on the Moon and Mars are some of the most fascinating and useful places we could explore. These are natural tunnels below the surface that could protect astronauts from radiation, provide a constant temperature, and could even be sealed off as a place for a habitat. Now, a new mission is under development called GIMLI that could use ground-penetrating radar to scan beneath the surface and map out the extent of a lunar cave network.<...
Awesome Astronomy - Extra: The Hubble Tuning Fork & Citizen Science
Paul Hill hosts solo!
Damien Phillips, John Wildridge and Dustin Ruoff produce.
In this podcast extra episode we talk to Dr. Karen Masters, Associate Professor of Physics and Astronomy at Haverford College, Pennsylvania about The Hubble Tuning Fork and Galaxy classification. But it's not only about that canonized galaxy classification system, it's also about how citizen science – astronomy done by absolutely anybody from their homes – can and does change the accepted wisdom and advance science.
Galaxy Zoo:
http://zoo1.galaxyzoo.org
Twelve Years of Galaxy Zoo:
Astronomy Cast Ep. 804: Mission Tech Series: Fairings, Docking & Airlocks
https://www.youtube.com/watch?v=GhkGOIAhBWc
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Streamed live on Oct 3, 2026.
Mission Tech Part 3.
Instead of sending up an entire space station for every mission, you can just send up a tiny can filled with astronauts. But that takes docking. And today we're gonna talk about what it takes to connect two spacecraft together. How to keep a cargo safe to get into orbit, and how to get in and out of your spacecraft without killing everyone!
Travelers in the Night Eps. 383 & 384: ET's Cigar & Dry Sands
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 April, 2026.
Today's 2 topics:
- In 2012 as it crossed the orbit of Neptune heading towards the Sun a small space rock was 250 times fainter than can be detected by the Hubble Space Telescope. Five years later, after it had rounded the Sun, it became visible in asteroid hunter's telescopes for about 16 days, as it streaked across our planet's orbit at 37 miles per second, as...
NOIRLab - First Magnetar Progenitor
Neutron stars, the compact remains of a massive star following a supernova explosion, are the densest matter in the Universe. Some neutron stars, known as magnetars, also claim the record for the strongest magnetic fields of any object. How magnetars, which are a mere 15 kilometers across, form and produce such colossal magnetic fields remains a mystery.
New observations by a team of astronomers, including NSF's NOIRLab's Dr. André-Nicolas Chené, may shed important light on the origin of these magnetic powerhouses. Using various telescopes around the globe, including the Canada-France-Hawai'i Telescope (CFHT) on Maunakea, the rese...
EVSN - Cloudy With a Chance of Brown Dwarfs: Terrestrial, Exo & Space Weather
From September 23, 2026.
This week we're doing a weather check.
No, really. Let's talk about the weather! All of them!
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...
Equatorial SkyGuide - October SkyGuide
Hosted by our Director, Avivah Yamani.
Explore October 2026's equatorial skies as we have Saturn at opposition, Mercury at dusk, Orionid meteors, and the Moon's celestial encounters.
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...
Awesome Astronomy - Baby Planet, the New Crater & the Decagon
October Part 1.
Paul Hill and Dr. Jenifer "Dr. Dust" Millard host.
Damien Phillips, John Wildridge and Dustin Ruoff produce.
We dive into autumn with a baby Planet, the SMILE mission, New weather on Saturn, a new crater on the moon, an update on Nancy Roman and a mission to Phobos. As well as our monthly sky and moon guide.
SMILE Mission Gif:
https://www.esa.int/Science_Exploration/Space_Science/Smile/Science_begins_for_Smile
We've added a new way to donate to 365 Days of As...
Ask A Spaceman Ep. 281: What Makes the Scattered Disk So Wild?
Solar System Badlands!
Hosted by Dr. Paul M. Sutter.
How did the scattered disk of the solar system form? What kins of strange objects roam those badlands? And what does it do to the rest of the solar system? 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 th...
Astronomy Cast Ep. 803: Mission Tech Series: Engines & Stages
https://www.youtube.com/watch?v=87imhw2ljNU
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Streamed on October 3, 2026.
Today our series continues with our deep dive into rockets, their engines & stages. We fall into the tyranny of the rocket equation and discover what it takes to escape Earth's gravity and head off into deep space.
We removed all ads from the show. We need to get to 1,500 patrons to keep it this way. We need your support!
We've added a new wa...
Travelers in the Night Eps. 381 & 382: Red Dwarf Planets & Fireball II
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 March 2026.
Today's 2 topics:
- Astronomers continue to be delighted when they discover an Earth sized planet. Scientists were thus very disappointed when the red dwarf star hosting the nearest such planet, Proxima Centauri b some 4.2 light years away, turns out to have the nasty habit of emitting bursts of radiation which are likely to sterilize and/or remove the atmospheres of it's family...
Space Stories - Astronomy Words: Dwarf Planet
Hosted by our Director, Avivah Yamani.
Why is Pluto a dwarf planet? Discover how new findings changed the definition of a planet—and our perspective on the Solar System.
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...
EVSN - All Things Solar System Evolution: Planet Formation, Composition & Asteroid Deflection
Hosted by: Dr. Pamela L. Gay (@CosmoQuest)
From February 20, 2020.
In today's episode we look at a variety of new results related to observing how planetary systems form, where planet ends up in solar system's (including in our own Jupiter's atmosphere!), and how rocks get flung at Earth even today.
Ice volcanoes videos etc.:
https://www.youtube.com/shorts/X3x9mOkN240
https://www.youtube.com/watch?v=HB27iJtxZrA
https://www.thehotelsaugatuck.com/blog/ice-volcanoes-and-ice-balls-oval-beach
We've added a new way to do...
Actual Astronomy - October Observer's Calendar
Hosted by Chris Beckett & Shane Ludtke, two amateur astronomers in Saskatchewan who enjoy teaching astronomy classes and showing the public views through their telescopes. [email protected]
(Times in Eastern)
- Oct 1: Moon at perigee; Beta Cephei colorful double star - Oct 2: Venus stationary; 41 Aquarii colorful double star; R Fornacis carbon star - Oct 3: Last Quarter Moon (9:25); Gegenschein high in S at midnight; 3 Cephei colorful double star - Oct 4: Saturn at opposition; Lunar Curtis X; Sirius unaided in daylight; Jupiter double shadow transit (12:49 AM); M30 well placed - Oct 5: Mars occulted by Moon (NW Canada); Mercury 5° N...Awesome Astronomy - An American Astronomer in Cwmdu
September Part 2.
Dustin Ruoff (!!!) and Dr. Jenifer "Dr. Dust" Millard host.
Damien Phillips, John Wildridge and Dustin Ruoff produce.
Live from AstroCamp! It's Chatty McChatty time again!
Dustin pops over the pond for a visit to AstroCamp!
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!
<...Cheap Astronomy - Dear CA Ep. 140: Objects & Objectives
Objective: objects!
Hosted by Steve Nerlich.
Dear Cheap Astronomy – How often does the solar system capture or eject things?
The first evidence that stellar systems might eject things were observations of rogue planets knocked out of their systems due to gravitational interactions and now populating interstellar space. For every rogue planet knocked out its system there are likely thousands of smaller objects also knocked out that are just too small for us to observe. We call this rogue population interstellar objects.
Dear Cheap Astronomy – What else is going on in th...
Astronomy Cast Ep. 802: Mission Tech Series: Rocket & Spacecraft 411
https://www.youtube.com/watch?v=hW_eLqrmjZ4
Streamed live on Sep 21, 2026
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Today we begin a new series on rockets and spacecraft, dealing with each of their components. It's a big job, so it'll take us a bunch of episodes to get through. Today let's do an introduction about what we're gonna talk about in this series: rockets from tip to tail, soup to nuts.
We've added a new way to donate to 365 Days of Astronomy to support e...
Travelers in the Night Eps. 379 & 380: Well Done & Odd Ball
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 March 2026.
Today's 2 topics:
- Once every 1,435 days , a 780 foot diameter space rock, 2017 TC1, that my Catalina Sky Survey teammate Carson Fuls discovered makes an annihilation defying close approach to our star. At it's nearest point to the Sun, Carson's well done space rock is traveling at an amazing 93 miles per second and receives 26 times the amount of solar radiation that heats the surface...
Guide To Space - Universe Today News: BepiColombo Successfully Begins Its Final Descent To Mercury
https://www.universetoday.com/articles/bepicolombo-successfully-begins-its-final-descent-to-mercury
Written by Andy Tomaswick - September 09, 2026.
Read by our editor, Richard Drumm.
The latest mission to the innermost planet in the solar system hit a milestone last week. After an eight year journey, BepiColombo finally separated from its propulsion stage to set itself up for an orbital insertion to Mercury.
Taking place on September 3rd, the separation, which is part of a much longer series of logistical steps over the next few months, seemed to go without a hitch. Because the two spacecraft wer...
EVSN - No Good, Very Bad News and Some Planetary Palate Cleansers
From September 16, 2026.
Join us as we bounce between the geology behind the recent landslide in Nepal and Tibet, the joy of Saturn's south pole forming a decagon, the frustration of both US and Russian space programs having launch capacity issues, and the good news of BepiColombo getting ready to enter Mercury's 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 fr...
