Archive | Aliens

Freeman Dyson theorized that eventually, a civilization would be able to build a megastructure around its star to capture all its energy. Credit: SentientDevelopments.com

Ep 388: Megastructures

This week astronomers announced an unusual transit signal from another star. Although it’s most likely a natural phenomenon, one remote possibility is that this is some kind of alien megastructure. Freeman Dyson and others have considered this idea for decades. Today we’ll talk about the kinds of structures that aliens might want to build. Download […]

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nn_08_pw_area51_130816

Ep. 346: Numbered Places: Area 51

Who knows what mysteries lurk at the military’s Area 51 complex in Nevada? Conspiracy theorists and UFO chasers think it’s a big alien coverup. But it’s probably something more boring, like advanced military aircraft. Let’s talk about what we know, and what we think we know about this infamous military base. Download the show [MP3] […]

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APOLLO 11 MOON LANDING

Ep. 339: Space Conspiracy Theories

Yes, we actually landed on the Moon. No, aliens didn’t crash land at Roswell. What is it about space exploration that leads to so many conspiracy theories? We’ll try to get to the bottom of these conspiracy theories, poke holes in their ridiculous ideas and help you build your baloney detection kit. Download the show […]

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FERRMI

Ep. 273: Solutions to the Fermi Paradox

In Episode 24 we presented the concept of the Fermi Paradox. In short: Where are all the aliens? Today we’re going to examine the theoretical solutions to this problem. Maybe they’re out there, but just don’t want to talk to us. Maybe it’s too hard to communicate? Maybe there are no other civilizations. Maybe civilizations […]




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Is this arsenic-based life?

Ep. 209: Exotic Life

We don’t like to cover news on Astronomy Cast, but sometimes there’s a news story that’s interesting, complicated, and rapidly unfolding – and it happens to cover an area that we haven’t talked much about. So today we thought we’d talk about the discovery of arsenic-based life, and exotic forms of life in general. Maybe […]

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Astrobiology

Ep. 143: Astrobiology

We know there’s life in the Universe. We see it all around us here on Earth. But is there life anywhere else? By studying the extremes that life can take here on Earth, scientists are learning just how hardy and adaptable life can really be. And if you consider other ways that life might function, […]

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Ep. 110: The Search for Extraterrestrial Intelligence

You know what this show needs? More aliens. Since we don’t seem to have any visiting right now, we’re going to have to find some. SETI is an acronym. It stands for the Search for Extraterrestrial Intelligence. But there’s more to SETI than just putting up a radio telescope and hoping to catch a glimpse […]

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