Archive | Cosmology

Ep 487: Dark Matter: 2018 Edition

Last week, we gave you an update in particle physics. This week it’s time to see what’s new in the world of dark matter. Spoiler alert, we still have no idea what it is, but maybe a few more ideas for what it isn’t. We usually record Astronomy Cast every Friday at 3:00 pm EDT […]

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Updated Audio: Ep. 475: Fast Radio Bursts

If you got the previous version of Ep. 475 with bad audio, here’s the fixed version! You know what’s fun? Mysteries. Here’s one: fast radio bursts. Astronomers have been detecting mysterious one-time signals from across the sky. What’s causing them? Nobody knows for sure, but the search is on to get to the bottom of […]

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Ep. 475: Fast Radio Bursts

The initial release of this audio was glitchy. We’ve fixed it now, so please re-download. You know what’s fun? Mysteries. Here’s one: fast radio bursts. Astronomers have been detecting mysterious one-time signals from across the sky. What’s causing them? Nobody knows for sure, but the search is on to get to the bottom of them. […]

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Ep. 397: A Universe From Nothing

One of the biggest, most basic questions you can ask is: “why is there something and not nothing?” The reality is that we don’t know the answer, we might never know the answer. Today we’ll investigate this mystery, recently covered by the physicist Lawrence Krauss in his book of the same name. Download the show […]

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Pamela facepalm. Photo courtesy Chuck Tomasi

Ep. 390: Occam’s Razor and the Problem with Probabilities

I’m not saying it’s aliens, but it’s aliens. Actually, it’s almost certainly not aliens, or a wormhole, or a multiverse. When scientists discover something unusual, they make guesses about what’s happening. But Occam’s Razor encourages us to consider the probabilities of different events before making any concrete predictions. Download the show [MP3] | Jump to […]

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isualization of the 93 billion light year three-dimensional observable universe.

Ep. 295: The Observable Universe

We understand our place in the Universe because of our direct observations. We can see the light that traveled billions of light years across space to reach us. This sphere of space is the observable universe; everything we can detect. But it’s really just a fraction of the larger, unobservable universe. Today, we’ll talk about […]

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Bullet Cluster

Ep. 179: Mysteries of the Universe, Part 2

Today we tackle more thrilling mysteries of the Universe. And by tackle, we mean, acknowledge their puzzling existence. Some mysteries will be solved shortly, others will likely trouble astronomers for centuries to come. Join us for part 2. (more…)

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Deep field image by Hubble

Ep. 166: Multiverses

What if our universe was just one in an infinite number of parallel universes; a possible outcome from the specific predictions of quantum mechanics. The idea of multiple universes is common in science fiction, but is there any actual science to back this theory up? (more…)

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