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NASA & TRAPPIST-1: A Treasure Trove of Planets Found

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Seven Earth-sized planets have been observed by NASA's Spitzer Space Telescope around a tiny, nearby, ultra-cool dwarf star called TRAPPIST-1. Three of these planets are firmly in the habitable zone. In this video, NASA Scientists explain the implications of this amazing find.

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TED-Ed Best of Web are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.

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