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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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...
Ep. 747: Rogue Planets
Streamed live on Mar 10, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay
Most planets orbit stars. That’s the rule, right? Well, maybe...
Ep. 746: Dust Storms
Streamed live Feb 24, 2025.
We have dust storms on Earth and of course the famous dust storms on Mars. There are even dust storms on Titan. What...
Ep. 745: How We Know If Asteroids Will Attack
Streamed live Feb 20, 2025.
I’m sure you’ve heard the news, asteroid 2024 YR4 has a tiny chance of hitting Earth in 2032. How do astronomers dis...
Ep. 744: Lunar Time
Streamed live on Feb 10, 2025.
What time is it? OK, fine, what time is it on the Moon? The Moon orbits the Earth, so it doesn’t fall into a spec...
Ep. 743: What Else Can We Learn From Gravitational Waves?
Streamed live on Feb 3, 2025.
Just a few years ago LIGO detected the first direct evidence of gravitational waves coming from colliding black ho...
Ep. 742: Atmospheric Gravity Waves
Streamed live on Jan 27, 2025.
Hosted by: Fraser Cain and Dr. Pamela L. Gay
Gravity Waves ... not gravitational waves ... move atmospheres...
Ep. 741: Technosignatures
Streamed live on Jan 20, 2025.
Pollution will ultimately give away a society.
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Ep. 740: Sneaky Stars!
Streamed live on Jan 13, 2025.
Why stars can’t be trusted!
If you’re an astronomer you depend on accurate observations of stars, but there...
Ep. 739: Drones!
Streamed live January 9, 2025.
From little Ingenuity to the future Firefly and all our Earth Science fliers, let's look at the buzzy scientists....
Ep. 738: Looking Ahead to 2025
What can we hope (or dread) to see in 2025?
Last week we talked about the 2024 strangeness. Now we’re gonna talk about the upcoming space storie...
Ep. 737: Weird Science Stories From 2024
Streamed live December13, 2024.
Hosted by: Fraser Cain and Dr. Pamela L. Gay.
2024 was a strange year! I’ll let your imagination take flig...
Ep. 736: Gift Guide 2024
Streamed live on Dec 2, 2024
Hosted by: Fraser Cain and Dr. Pamela L. Gay
It’s time for our Holiday Gift Guide, where we suggest ideas for...
Ep. 735: Albert Einstein
Streamed live on Nov 25, 2024.
Last week we talked about the Einstein probe. So this week it is only natural that we talk about the man himself,...
Ep. 734: The Einstein Mission
Streamed live on Nov 11, 2024.
Hosted by: Fraser Cain and Dr. Pamela L. Gay.
Another day, another space telescope! Today we’re looking at...
Ep. 733: Euclid Of Alexandria
Streamed live on Nov 5, 2024.
Last week we talked about the mission. This week we’ll talk about Euclid of Alexandria, the ancient Greek mathemat...
Ep. 732: The Euclid Telescope
Let's look at the Euclid Space Telescope.
The Euclid 208-Gigapixel image!
https://www.youtube.com/watch?v=86ZCsUfgLRQ