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Astronomy Cast: Daily Summaries Delivered
by Fraser Cain and Dr. Pamela Gay
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.
Latest Episodes
The most recent episodes — sign up to get AI-powered summaries of each one.
- 2 days ago31 min
Ep. 807: Mission Tech Series: Ion Drives
Astronomy Cast Ep. 807: Mission Tech Series: Ion Drives 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!
- 1 weeks ago29 min
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 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
- 2 weeks ago33 min
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, 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!
- 3 weeks ago30 min
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 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! Hosted by: Fraser Cain (@frasercain) and Dr. Pamela L. Gay (@CosmoQuest) Streamed live on Oct 3, 2026. Mission Tech Part 3.
- Oct 5, 202636 min
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 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!
- Sep 28, 202632 min
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. Pamela L. Gay 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.
- Sep 21, 202637 min
Ep. 801: The Beginning & End of Everything - Part 2
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 Today we do the sequel to our 2-part series. We jump to the end of the Universe, and all the major moments that will occur from now until the heat death of the Universe. The end of everything. - The fate & future of the Milky Way - Cosmic isolation - The cosmic microwave background - The end of star formation - The degenerate era - Proton decay and entropy - Black hole evaporation & entropy - Alternate endings, cosmic rip, new beginnings - Closing thoughts and updates
- Sep 15, 20268 min
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
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About Astronomy Cast
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.
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Frequently Asked Questions
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It's a free AI-powered email that summarizes new episodes of Astronomy Cast as soon as they're published. You get the key takeaways, notable quotes, and links & mentions — all in a quick read.
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When a new episode drops, our AI transcribes and analyzes it, then generates a personalized summary tailored to your interests and profession. It's delivered to your inbox every morning.
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