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. Astronomy Cast is supported thru patreon.com/AstronomyCast.
- Update frequency
- every 7 days
- Average duration
- 31 minutes
- Episodes
- 644
- Years Active
- 2006 - 2025
Ep. 546: Weird Issues: Planetary Migration
546: Weird Issues: Planetary Migration Astronomy Cast 546: Weird Issues: Planetary Migration by Fraser Cain & Dr. Pamela Gay Before we discovered other planets, our Solar System seemed like a perfect…
00:28:58 |
Mon 11 Nov 2019
Ep. 545: Weird Issues: Are comets asteroids or are asteroids comets?
545: Weird Issues: Are comets asteroids or are asteroids comets? Astronomy Cast 545: Weird Issues: Are comets asteroids or are asteroids comets? by Fraser Cain & Dr. Pamela Gay Things used to be so s…
00:29:53 |
Tue 05 Nov 2019
Ep. 544: Weird Issues: Biosignatures
544: Weird Issues: Biosignatures Astronomy Cast 544: Weird Issues: Biosignatures by Fraser Cain & Dr. Pamela Gay Once again, another place where the Universe is going to make this difficult for us. …
00:29:56 |
Mon 28 Oct 2019
Halley's Meteor Shower and Two spacecraft updates
Got clear skies? Go out tonight and catch the Orionids Meteor shower, a storm of falling stars generated by Halley's comet. Later this week, we'll see aurora like those that will one day be predicted…
00:07:00 |
Mon 21 Oct 2019
Ep. 543: Weird Issues: The Habitable Zone
543: Weird Issues: The Habitable Zone Astronomy Cast 543: Weird Issues: The Habitable Zone by Fraser Cain & Dr. Pamela Gay Our series on Universe weirdness marches on. This week we take a look at the…
00:27:55 |
Sun 20 Oct 2019
Ep. 542: Weird Issues: The Age of the Universe
542: Weird Issues: The Age of the Universe Astronomy Cast 542: Weird Issues: The Age of the Universe by Fraser Cain & Dr. Pamela Gay Our series on Universe weirdness continues, this time we learn how…
00:29:32 |
Mon 14 Oct 2019
Ep. 541: Weird Issues: Expansion Rate of the Universe
541: Weird Issues: Expansion Rate of the Universe Astronomy Cast 541: Weird Issues: Expansion Rate of the Universe by Fraser Cain & Dr. Pamela Gay Just when the Universe was starting to make sense, …
00:29:01 |
Mon 07 Oct 2019
Ep. 540: Weird Issues: How Do (or Don't) Planets Form?
540: Weird Issues: How Do (or Don't) Planets Form? Astronomy Cast 540: Weird Issues: How Do (or Don't) Planets Form? by Fraser Cain & Dr. Pamela Gay As astronomers started to discover planets orbitin…
00:31:19 |
Mon 30 Sep 2019
Ep. 539: Weird Issues: Why We Don't Know the Age of Saturn's Rings
539: Weird Issues: Why We Don't Know the Age of Saturn's Rings Astronomy Cast 539: Weird Issues: Why We Don't Know the Age of Saturn's Rings by Fraser Cain & Dr. Pamela Gay How old are Saturn's rings…
00:30:09 |
Mon 23 Sep 2019
Ep. 538: Asteroids: Rubble piles of the Solar System
538: Asteroids: Rubble piles of the Solar System Astronomy Cast 538: Asteroids: Rubble piles of the Solar System by Fraser Cain & Dr. Pamela Gay Thanks to all the work from Hayabusa 2 and OSIRIS-REx,…
00:31:02 |
Mon 16 Sep 2019
Ep. 537: Reusable Rocket Revolution
537: Reusable Rocket Revolution Astronomy Cast 537: Reusable Rocket Revolution by Fraser Cain & Dr. Pamela Gay We took a hiatus this summer, but SpaceX sure didn’t, with the tests of the Starhopper p…
00:37:38 |
Mon 09 Sep 2019
Libsyn Survey Request
Please help us keep bringing you content by going to and filling out the survey, so Libsyn can find us sponsors for Astronomy Cast!
00:00:54 |
Sat 10 Aug 2019
Astronomy Cast on Hiatus until Sept 2019
Astronomy Cast will be on hiatus for July and August. Don't worry, we'll be back in September, and we might just have surprises for you all along this summer! Don't forget you can still catch Pamela …
00:02:03 |
Mon 01 Jul 2019
Ep. 536: Everyday Relativity
536: Everyday Relativity Astronomy Cast 536: Everyday Relativity by Fraser Cain & Dr. Pamela Gay Relativity is used in more day to day situations than you may realize. In this episode, we will count …
00:35:19 |
Mon 01 Jul 2019
Ep. 535: Astronomy-Related Things To Do This Summer
535: Astronomy-Related Things To Do This Summer Astronomy Cast 535: Astronomy-Related Things To Do This Summer by Fraser Cain & Dr. Pamela Gay It's summertime, and time for our annual Astronomy Cast…
00:33:59 |
Mon 24 Jun 2019
Ep. 534: Modern South African Astronomy
534: Modern South African Astronomy Astronomy Cast 534: Modern South African Astronomy by Fraser Cain & Dr. Pamela Gay You know the drill now. Last week we talked about ancient south African astronom…
00:34:06 |
Mon 17 Jun 2019
Ep. 533: Indigenous South African Astronomy
533: Indigenous South African Astronomy Astronomy Cast 533: Indigenous South African Astronomy by Fraser Cain & Dr. Pamela Gay Let's move to another continent this week, and look at the astronomy th…
00:34:26 |
Mon 10 Jun 2019
Ep. 532: Modern Astronomy of Australia
532: Modern Astronomy of Australia Astronomy Cast 532: Modern Astronomy of Australia by Fraser Cain & Dr. Pamela Gay Last week we talked about how well the indigenous Australians followed the night s…
00:35:22 |
Mon 03 Jun 2019
Ep. 531: Australian Indigenous Astronomy
531: Australian Indigenous Astronomy Astronomy Cast 531: Australian Indigenous Astronomy by Fraser Cain & Dr. Pamela Gay South America, especially the Atacama Desert in Chile has become one of the be…
00:31:04 |
Mon 27 May 2019
Ep. 530: Astronomy of the Andes - Then and Now Pt. 2
530: Astronomy of the Andes - Then and Now Pt. 2 Astronomy Cast 530: Astronomy of the Andes - Then and Now Pt. 2 by Fraser Cain & Dr. Pamela Gay South America, especially the Atacama Desert in Chile…
00:31:18 |
Sun 12 May 2019
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