Could life on Earth have arrived from space? Explore panspermia, alien comets, and how life might spread across the galaxy.

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Credits: Panspermia - Could Alien Comets Be Seeding Life Through the Universe?

Written, Produced & Narrated by: Isaac Arthur

Editors: Alex Shenderov & Lukas Konecny

Select imagery/video supplied by Getty Images

Music by Epidemic Sound: http://nebula.tv/epidemic