Astronomer at the Space Telescope Science Institute in Baltimore Nikole Lewis presents research findings during a TRAPPIST-1 planets briefing, Wednesday, Feb. 22, 2017 at NASA Headquarters in Washington. Researchers revealed the first known system of seven Earth-size planets around a single star called TRAPPIST-1. Photo Credit: (NASA/Bill Ingalls) Nikole Lewis during a TRAPPIST-1 planets briefing

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