Is Humanity Unusual In The Cosmos?

<img src='https://media.npr.org/assets/img/2018/04/02/eso0515c_wide-617dc798bb515e0854aed96c2cce1b6fbcab0437.jpg?s=600' alt='Artist's rendering of the first planet outside of our solar system to be imaged orbiting a brown dwarf star, called the 2M1207 system.'/>Commentator Adam Frank talks with Harvard astrophysicist Avi Loeb about exo-civilizations, techno-signatures, and the search for alien life — living or long-gone.

(Image credit: ESO)

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