Keeping the Solar System clean to find alien life

Humans have always wanted to know if life exists elsewhere in the Universe, but how will we know an alien if we see one? That’s where planetary protection comes in — the idea of avoiding harmful contamination of our Solar System. Subscribe: https://goo.gl/G5RXGs Check out our full video catalog: https://goo.gl/lfcGfq Visit our playlists: https://goo.gl/94XbKx Like The Verge on Facebook: https://goo.gl/2P1aGc Follow on Twitter: https://goo.gl/XTWX61 Follow on Instagram: https://goo.gl/7ZeLvX Read More: http://www.theverge.com

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