16 Mind-Boggling Discoveries Scientists Made in 2017

Three Earth-like planets

Astronomers found not just one but seven planets outside our solar system that circle a tiny star called TRAPPIST-1, about 40 light-years away. Three are in what NASA calls the habitable zone, which could be right for water to exist and possibly for extraterrestrial life. Think you know all there is to know about earth now? Take this quiz to find out.

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