Astronomy Cast

Take a facts-based journey through the universe.


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13 Seasons and more than 500 episodes await.

Ep. 599: Zodiacal Light

Ep. 599: Zodiacal Light

Pamela has told us in the most flowery terms about the diffuse dust across inner solar system. Leftover from the formation the inner planets. Well, it turns out, she was wrong. Super wrong. Time to update.

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Ep. 598: How You Could Overturn Cosmology

Ep. 598: How You Could Overturn Cosmology

You’ve probably heard of dark matter and dark energy, but maybe you don’t fully understand what they are. Or maybe the idea itself just rubs you the wrong way and you’d like to know why scientists think they can just make stuff up like this. So you’d like to overturn cosmology? Here’s all you need to do.

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Ep. 597: The Expansion of the Universe (Updated)

Ep. 597: The Expansion of the Universe (Updated)

It’s been a while since we checked to make sure the Universe was still expanding. Yeah, apparently, that’s still a thing. But in the last few years powerful new telescopes and expansive surveys have given us much more knowledge about what’s happening.

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