365 Days of Astronomy - Weekly Edition
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365 Days of Astronomy - Weekly Edition
This is the full live stream audio of the Astronomy Cast episodes. The first half hour is the regular episode, and the second half hour is a Q&A session with questions submitted by live viewers and email.
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512 حلقة
Ep. 787: Evolved Stars (They're not dead yet!)
Streamed live on Mar 16, 2026.
Main sequence stars spend most of their time being… normal. Fusing hydrogen into helium in their cores. Producing...
Ep. 786: Wolf-Rayet Stars
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Streamed live on Mar 9, 2026.
You think the Sun is a terrifying b...
Ep. 785: Magnetars
Hosted by: Fraser Cain (@frasercain ) and Dr. Pamela L. Gay (@CosmoQuest )
Streamed live March 6, 2026.
Magnetars are a special type of ne...
Ep. 784: Pulsar-Powered Science
Streamed live on Feb 16, 2026.
Pulsars are dead stars and fascinating in their own right, but astronomers can use their predictable rotation for...
Ep. 783: Cataclysmic Variable Stars
Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest)
Streamed live on Feb 16, 2026.
There are many types of variable s...
Ep. 782: Luminous Fast Blue Optical Transients
Streamed live on Feb 13, 2026.
Modern astronomy has found that the Universe can surprise us. Here’s one which astronomers have called Luminous F...
Ep. 781: Awakening Black Holes
Streamed live on Feb 2, 2026.
One long standing mystery in astronomy were the quasars. Incomprehensible energy blasting out of a point-like sour...
Ep. 780: When Asteroids & Comets Attack!
Hosted by: Fraser Cain (@frasercain ) and Dr. Pamela L. Gay (@CosmoQuest )
Streamed live on Jan 26, 2026.
We live in a cosmic shooting gal...
Ep. 779: Milankovitch Cycles
Streamed live on Jan 12, 2026.
Hosted by: Fraser Cain (@frasercain ) and Dr. Pamela L. Gay (@CosmoQuest )
Humans live short lives, and fro...
Ep. 778: Dyson Swarms
Streamed live on Jan 5, 2026.
Freeman Dyson asked a fascinating question. What would it look like if a civilization was using all the energy com...
Ep. 777: The Eddington Limit
Streamed live on Dec 29, 2025.
How big can a star get? This is a calculation made by one of the original pioneers of modern astronomy, Sir Arthu...
Ep. 776: The Matter - Antimatter Dichotomy
Streamed live on Dec 22, 2025.
Shortly after the big bang there were almost exactly the same amounts of matter and antimatter in the Universe, b...
Ep. 775: The Hydrogen 21-cm Line
Streamed live on Dec 15, 2025.
Atomic hydrogen is the raw material for stars, but there’s a problem. It’s cold & dark, but it can do a very rare...
Ep. 774: How Does Bad Science Happen?
Hosted by: Fraser Cain and Dr. Pamela L. Gay.
Streamed live on Nov 8, 2025.
[Editor's Note: Fraser says "Episode 773" at the head of the s...
Ep. 773: What Would You Do With $1 Billion For Astronomy?
Hosted by: Fraser Cain and Dr. Pamela L. Gay.
Streamed live on Nov 9, 2025.
We are powerless fans of space exploration. But what if some f...
Ep. 772: 2025 Gift Guide
Hosted by: Fraser Cain and Dr. Pamela L. Gay.
Streamed live on Nov 9, 2025.
It’s time once again for our annual gift giving guide. We’ve g...
Ep. 771: Comet Tails
Streamed live on Nov 8, 2025.
With the arrival of the comet 3I/Atlas (Asteroid Terrestrial-impact Last Alert System), the world is getting a cra...
Ep. 770: The Ethics of Mars Exploration
Streamed live on Nov 3, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay.
It is arguable that humanity now has the technological ability...
Ep. 769: Little Red Dots
Streamed live on Oct 20, 2025.
New instruments bring new mysteries, and when James Webb came on line it uncovered a collection of strange, compa...
Ep. 768: Comets' Unpredictability
Streamed live on Oct 13, 2025.
So it’s been decades since we’ve seen a bright comet in the sky. And actually there was a pair — Hale-Bopp and Hy...
Ep. 767: Black Holes in Extreme Circumstances
Hosted by: Fraser Cain and Dr. Pamela L. Gay
Streamed live on Oct 6, 2025.
You can only describe a black hole by its mass and its spin. An...
Ep. 766: How Spacecraft End
End-of-Life Planning for Your Spacecraft!
Streamed live October 1, 2025.
Your spacecraft has reached the end of its mission. You’ve done e...
Ep. 765: Rockets vs The Environment
Streamed live on Sep 22, 2025.
We don’t launch a lot of rockets every year, so their impact on the environment is minimal compared to other form...
Ep. 764: Cleared For Launch!
Streamed live September 17, 2025.
This week, we look at the process behind rockets getting licensed to launch, and everyone around the pad getti...
Ep. 763: Interstellar Comets
Streamed live Sep 8, 2025.
Welcome to the first episode of our 19th season! This week we look at objects coming from other solar systems that co...
Ep. 762: Science in Crisis - NASA’s New Budget
Streamed live on Jun 30, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay
Normally we try to end the season on a high note. But there’s...
Ep. 761: It's Here! The Vera Rubin Observatory
Streamed live June 25, 2025.
The time has come. The mighty Vera Rubin Observatory has finally come on line and delivered its “first light” image...
Ep. 760: What to Look For This Summer
Hosted by: Fraser Cain and Dr. Pamela L. Gay
Streamed live on Jun 16, 2025.
It’s almost time for our annual summer hiatus, but before we g...
Ep. 759: The Commercial Space Program
Streamed live on Jun 9, 2025.
Humanity has turned its focus back to the Moon, sending a fleet of spacecraft to the lunar surface. Some are run b...
Ep. 758: Non-Roving Rovers
Streamed live on May 26, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay
Some of our favorite robots are rovers currently roving around...
Ep. 757: CubeSats
Streamed live on May 19, 2025.
Computers are getting smaller, faster and more capable, which has enabled an entirely mew class of satellites: Cu...
Ep. 756: SphereX
Streamed live on May 12, 2025.
NASA’s newly launched SphereX mission is up & operational and has completed its initial checkout and “first light...
Ep. 755: Intermediate Mass Black Holes
Streamed live on May 5, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay.
There are stellar-mass and supermassive black holes. But very...
Ep. 754: K2-18b
Streamed live on Apr 28, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay
You’ve heard the news! Astronomers are reporting the discovery...
Ep. 753: Why is the Moon's South Pole So Interesting?
Streamed live on Apr 21, 2025.
I’m sure you’ve heard that all eyes are on the Moon’s southern pole. This is where various NASA and Chinese miss...
Ep. 752: Should We Go to the Moon or Mars Next?
Streamed live on Apr 16, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay
There is an ongoing debate on where NASA should go next with h...
Ep. 751: Vacuum Energy
Streamed live on Apr 7, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay.
Even empty space isn’t empty. It’s filled with the quantum flu...
Ep. 750: Supernova Early Warning System
Streamed live on Mar 31, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay
When enormous stars detonate as supernovae they release a burs...
Ep. 749: Dark Energy Changing Over Time
Streamed live on Mar 24, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay
The Hubble Tension is a vexing problem, with astronomers measu...
Ep. 748: Fast Radio Bursts
Streamed live on Mar 17, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay.
For the briefest of moments, some dead stars can flash bright...