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Astronomy Cast

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May 29, 2023

Astronomy Cast Ep. 683: Cosmic Dawn

by Fraser Cain & Dr. Pamela Gay

Streamed live on May 22, 2023.

After the cosmic microwave background radiation was released, the Universe returned to darkness, cloaked in this clouds of primordial hydrogen and helium. Gravity pulled these vast clouds into the first stars, and then the...

May 22, 2023

Astronomy Cast Ep. 682: Ultra-Diffuse Galaxies & Dark Matter

by Fraser Cain & Dr. Pamela Ga

Streamed live on May 15, 2023.

Astronomers first noticed the strange behaviors of rotating galaxies almost 100 years ago, suggesting there’s an invisible dark matter hold them together with gravity. Or maybe we just...

May 15, 2023

Astronomy Cast Ep. 681: Kilonovae

by Fraser Cain & Dr. Pamela Gay

Streamed live on May 7, 2023.

In 2017, astronomers detected the gravitational waves and electromagnetic radiation from colliding neutron stars. This had been long theorized as one of the causes of a certain type of gamma-ray burst. By studying the event...

May 8, 2023

Astronomy Cast Ep. 680: Rogue Black Holes

by Fraser Cain & Dr. Pamela Gay

Streamed live on May 1, 2023.

Last week we talked about rogue stars. This week we’re going to take things up a notch and talk about an even more extreme event. Rogue black holes. Astronomers recently discovered a supermassive black hole on an...

May 1, 2023

Astronomy Cast Ep. 679: High(per) Velocity Stars

by Fraser Cain & Dr. Pamela Gay

Streamed live on Apr 24, 2023.

Most stars in the Milky Way are trapped in here with us, doomed to orbit around and around and around. But a few have found a way out, an escape into the freedom of intergalactic space. How do stars reach...