Ep. 775: The Hydrogen 21-cm Line
Astronomy Cast22 Joulu 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. 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 Syys 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 Syys 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 Heinä 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 Kesä 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 Kesä 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 Kesä 202535min

Ep. 758: Non-Roving Rovers

Ep. 758: Non-Roving Rovers

Astronomy Cast Ep. 758: Non-Roving Rovers By Fraser Cain & Dr. Pamela Gay Streamed live on May 26, 2025. Some of our favorite robots are rovers currently roving around the surface of the Moon & Mars. ...

2 Kesä 202531min

Ep. 757: CubeSats

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 satel...

26 Touko 202533min

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