Astrophysicist Avi Loeb wants to hunt for pollution in other planets’ atmospheres to determine whether or not we are alone in the universe.

Learn more by watching "NOVA Wonders: Are We Alone?" at: http://www.pbs.org/wgbh/nova/wonders/#are-we-alone

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PRODUCTION CREDITS

Digital Producer: Michael Rivera

NOVA WONDERS ARE WE ALONE? Produced and Directed By: Jane Teeling and Phil Bertelsen

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