Ep. 775: The Hydrogen 21-cm Line
Astronomy Cast22 Dec 2025

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, releasing a photon in a very specific wavelength, known as the 21 centimeter line. And thanks to this wavelength astronomers have mapped out star forming regions across the Milky Way, the Universe and into the Dark Ages! This forbidden transition of Hydrogen has led to the mapping of galaxy rotation, a cool classroom application of quantum mechanics, and weirdly no Nobel prize. In this episode, Fraser and Pamela take a look at this line's out-of-proportion awesomeness! This show is supported through people like you on Patreon.com/AstronomyCast In this episode, we'd like to thank: Andrew Poelstra, BogieNet, Brian Cagle, Burry Gowen, David, David Rossetter, Ed, Gerhard Schwarzer, Jason Kwong, Jeanette Wink, Michael Purcell, Sergey Manouilov, Siggi Kemmler, Sérgio Sancevero

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Ep. 766: How Spacecraft End

Ep. 766: How Spacecraft End

Astronomy Cast Ep. 766: How Spacecraft End By Fraser Cain & Dr. Pamela Gay End-of-Life Planning for Your Spacecraft! Streamed live October 1, 2025. Your spacecraft has reached the end of its mission. ...

6 Okt 202530min

Ep. 765: Rockets vs The Environment

Ep. 765: Rockets vs The Environment

Astronomy Cast Ep. 765: Rockets vs The Environment By Fraser Cain & Dr. Pamela Gay Streamed live on Sep 22, 2025. We don't launch a lot of rockets every year, so their impact on the environment is min...

29 Sep 202535min

Ep. 764: Cleared For Launch!

Ep. 764: Cleared For Launch!

Astronomy Cast Ep. 764: Cleared For Launch! By Fraser Cain & Dr. Pamela Gay Streamed live September 17, 2025. This week, we look at the process behind rockets getting licensed to launch, and everyone ...

22 Sep 202533min

Ep. 763: Interstellar Comets

Ep. 763: Interstellar Comets

Astronomy Cast Ep. 763: Interstellar Comets By Fraser Cain & Dr. Pamela Gay Streamed live Sep 8, 2025. Welcome to the first episode of our 19th season! This week we look at objects coming from other s...

15 Sep 202530min

Ep. 762: Science in Crisis - NASA's New Budget

Ep. 762: Science in Crisis - NASA's New Budget

Astronomy Cast Ep. 762: Science in Crisis - NASA's New Budget By Fraser Cain & Dr. Pamela Gay Streamed live on Jun 30, 2025. Hosted by: Fraser Cain and Dr. Pamela L. Gay Normally we try to end the sea...

7 Juli 202548min

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

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...

30 Juni 202530min

Ep. 760: What to Look For This Summer

Ep. 760: What to Look For This Summer

Astronomy Cast Ep. 760: What to Look For This Summer By Fraser Cain & Dr. Pamela Gay Streamed live on Jun 16, 2025. It's almost time for our annual summer hiatus, but before we go, we wanted to direct...

23 Juni 202528min

Ep. 759: The Commercial Space Program

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 ...

16 Juni 202535min

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