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Astronomy Cast

von Fraser Cain and Dr. Pamela Gay

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Take a fact-based journey through the cosmos. Tune in to hear weekly discussions on astronomical topics ranging from planets to cosmology. Hosted by Fraser Cain (Universe Today) and Dr. Pamela L. Gay (Planetary Science Institute), this show brings the questions of an avid astronomy lover direct to an astronomer. Together Fraser and Pamela explore what is known and being discovered about the universe around us. Astronomy Cast is supported thru patreon.com/AstronomyCast.

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  1. Ep. 806: Mission Tech Series: Thrusters

    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 i

  2. Ep. 805: Mission Tech Series: Gyroscopes & Servos

    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, s

  3. Ep. 804: Mission Tech Series: Fairings, Docking & Airlocks

    Ad-Free thanks to your support at patreon.astronomycast.com! 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 w

  4. Ep. 803: Mission Tech Series: Engines & Stages

    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 di

  5. Ep. 802: Mission Tech Series: Rocket & Spacecraft 411

    Help us keep Astronomy Cast ad-free: https://patreon.com/astronomycast We removed all ads from the show. We need to get to 1500 patrons to keep it this way. We need your support! Streamed live on Sep 21, 2026 Hosted by: Fraser Cain and Dr.

  6. Ep. 801: The Beginning & End of Everything - Part 2

    Help us keep Astronomy Cast ad-free: https://patreon.com/astronomycast We removed all ads from the show. We need to get to 1500 patrons to keep it this way. We need your support! Streamed live on Sep 7, 2026. Hosted by: Fraser Cain (@fraser

  7. Astronomy Cast Can't Go On Like This

    After 20 years, it's time to make some changes. With your patronage we can ditch the ads & turn up the science. Please join our Patreon community at patreon.astronomycast.com

  8. Ep. 800: The Beginning & End of Everything - Part 1

    Streamed live on Sep 7, 2026. Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest) This show is supported through people like you on Patreon.com/AstronomyCast To celebrate our 20th season, we thought we'd go back right t

  9. Ep. 799: Heavy Lift Rockets

    Astronomy Cast Ep. 799: Heavy Lift Rockets By Fraser Cain & Dr. Pamela Gay Streamed live June 22, 2026. The Saturn 5 was a monster, capable of sending humans and a lander to the Moon and bringing them back again. But the number of heavy lif

  10. Ep. 797: Summer in Space

    Astronomy Cast Ep. 797: Summer in Space By Fraser Cain & Dr. Pamela Gay Streamed live June 10, 2026. We're about to take a much needed 2 month hiatus. But just because we're not here doesn't mean space stops existing and doing things. Today

  11. Ep. 796: Oceans & Organics on Mars

    Astronomy Cast Ep. 796: Oceans & Organics on Mars By Fraser Cain & Dr. Pamela Gay Streamed live on Jun 1, 2026. Mars is cold & dry today, but the evidence is growing that it used to be warmer & wetter. with seas & oceans that covered large

  12. Ep. 795: Expanse Science

    Astronomy Cast Ep. 795: Expanse Science By Fraser Cain & Dr. Pamela Gay Streamed live on May 10, 2026. This is the final episode of our series on sci-fi universes. And this week we will tackle "The Expanse". Now we've got fusion drives, Pro

  13. Ep. 794: Stargate Science

    Astronomy Cast Ep. 794: Stargate Science By Fraser Cain & Dr. Pamela Gay Streamed live on May 10, 2026. We continue our ad-hoc miniseries through sci-fi franchises. This week we'll talk about Stargate, worm holes, mind parasites and self-re

  14. Ep. 793: Star Trek Science

    Astronomy Cast Ep. 793: Star Trek Science By Fraser Cain & Dr. Pamela Gay Streamed live May 4, 2026. Today we continue our mini-series; evaluating the science of various sci-fi franchises. We did Star Wars last week, this week tackle Star T

  15. Ep. 792: Star Wars Science

    Astronomy Cast Ep. 792: Star Wars Science By Fraser Cain & Dr. Pamela Gay Streamed live April 29, 2026. May the fourth be with you! Isn't that what people say on the international holiday known as Star Wars Day? Today we're gonna talk about

  16. Ep. 775: The Hydrogen 21-cm Line

    Astronomy Cast Ep. 775: The Hydrogen 21-cm Line By Fraser Cain & Dr. Pamela Gay 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 trick, releasin

  17. Ep. 761: It's Here! The Vera Rubin Observatory

    Astronomy Cast Ep. 761: It's Here! The Vera Rubin Observatory By Fraser Cain & Dr. Pamela Gay Streamed live June 25, 2025. The time has come. The mighty Vera Rubin Observatory has finally come on line and delivered its "first light" images.

  18. Ep. 759: The Commercial Space Program

    Astronomy Cast Ep. 759: The Commercial Space Program By Fraser Cain & Dr. Pamela Gay 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 by the gover

  19. Ep. 757: CubeSats

    Astronomy Cast Ep. 757: CubeSats By Fraser Cain & Dr. Pamela Gay Streamed live on May 19, 2025. Computers are getting smaller, faster and more capable, which has enabled an entirely mew class of satellites: CubeSats. A mission small enough

  20. Ep. 756: SphereX

    Astronomy Cast Ep. 756: SphereX By Fraser Cain & Dr. Pamela Gay Streamed live on May 12, 2025. NASA's newly launched SphereX mission is up & operational and has completed its initial checkout and "first light". Everything looks good! And no

  21. Ep. 755: Intermediate Mass Black Holes

    Astronomy Cast Ep. 755: Intermediate Mass Black Holes By Fraser Cain & Dr. Pamela Gay 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 little evidence

  22. Ep. 753: Why is the Moon's South Pole So Interesting?

    Astronomy Cast Ep. 753: Why is the Moon's South Pole So Interesting? By Fraser Cain & Dr. Pamela Gay 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

  23. Ep. 752: Should We Go to the Moon or Mars Next?

    Astronomy Cast Ep. 752: Should We Go to the Moon or Mars Next? By Fraser Cain & Dr. Pamela Gay 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 humans:

  24. Ep. 748: Fast Radio Bursts

    Astronomy Cast Ep. 748: Fast Radio Bursts By Fraser Cain & Dr. Pamela Gay Streamed live on Mar 17, 2025. For the briefest of moments, some dead stars can flash brighter than their entire galaxy (in Radio light) and then live to do it again

  25. Ep. 746: Dust Storms

    Astronomy Cast Ep. 746: Dust Storms By Fraser Cain & Dr. Pamela Gay 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 causes these storms and how

  26. Ep. 741: Technosignatures

    Astronomy Cast Ep. 741: Technosignatures By Fraser Cain & Dr. Pamela Gay Streamed live on Jan 20, 2025. As humanity developed more advanced technology, we're having a larger effect on our environment. The more we do, the more we could be de

  27. Ep. 740: Sneaky Stars!

    Astronomy Cast Ep. 740: Sneaky Stars! By Fraser Cain & Dr. Pamela Gay 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's a problem. Stars are sneaky!

  28. Ep. 739: Drones!

    Astronomy Cast Ep. 739: Drones! By Fraser Cain & Dr. Pamela Gay 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. NASA's Mars Ingenuity helicopte

  29. Ep. 736: Gift Guide 2024

    Astronomy Cast Ep. 736: Gift Guide 2024 By Fraser Cain & Dr. Pamela Gay Streamed live on Dec 2, 2024 It's time for our Holiday Gift Guide, where we suggest ideas for presents for the space fans in your life! What books are we reading? What

  30. Ep. 735: Albert Einstein

    Astronomy Cast Ep. 735: Albert Einstein By Fraser Cain & Dr. Pamela Gay 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, Albert Einstein. He rev

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