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. 748: Fast Radio Bursts

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 Ra...

24 Maalis 202528min

Ep. 747: Rogue Planets

Ep. 747: Rogue Planets

Streamed live on Mar 10, 2025. Hosted by: Fraser Cain and Dr. Pamela L. Gay Most planets orbit stars. That's the rule, right? Well, maybe not. In fact the vast majority of planets could be floating fr...

17 Maalis 202529min

Ep. 746: Dust Storms

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...

3 Maalis 202528min

Ep. 745: How We Know If Asteroids Will Attack

Ep. 745: How We Know If Asteroids Will Attack

Astronomy Cast Ep. 745: How We Know If Asteroids Will Attack By Fraser Cain & Dr. Pamela Gay Streamed live Feb 20, 2025. I'm sure you've heard the news, asteroid 2024 YR4 has a tiny chance of hitting ...

24 Helmi 202530min

Ep. 744: Lunar Time

Ep. 744: Lunar Time

Astronomy Cast Ep. 744: Lunar Time By Fraser Cain & Dr. Pamela Gay Streamed live on Feb 10, 2025. What time is it? OK, fine, what time is it on the Moon? The Moon orbits the Earth, so it doesn't fall ...

17 Helmi 202531min

Ep. 741: Technosignatures

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....

27 Tammi 202536min

Ep. 740: Sneaky Stars!

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, b...

20 Tammi 202530min

Ep. 739: Drones!

Ep. 739: Drones!

Astronomy Cast Ep. 740: 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 sci...

13 Tammi 202531min

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