Archive | Cosmology


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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Evolution of the large scale structure of the Universe. Image credit: NASA

Ep. 137: Large Scale Structure of the Universe

This week we’re going to think big. Bigger than big. We’re going to consider the biggest things in the Universe. If you could pull way back, and examine regions of space billions of light-years across, what would you see? How is the Universe arranged at the largest scale? And more importantly… why? (more…)

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Supernova remnant W49B, seen in X-rays and visible light.

Ep. 135: X-Ray Astronomy

We continue our journey through the electromagnetic spectrum with X-rays. If you’ve ever broken a bone, you probably know how X-rays are most commonly used. While doctors use X-rays to study the human body, and astronomers use X-rays to study some of the hottest places in the Universe. So let’s put on our X-ray specs, […]

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M81 in ultraviolet. Image credit: NASA

Ep. 134: Ultraviolet Astronomy

Our next visit in this tour through the electromagnetic spectrum is the ultraviolet. You can’t see it, but anyone who’s spent a day out in the hot sun without sunblock has sure experienced its effects. Ultraviolet radiation is associated with the birth of stars and some of the hottest places in the Universe. (more…)

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