Professor of planetary science and physics at Massachusetts Institute of Technology, Cambridge, Sara Seager 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) Sara Seager during a TRAPPIST-1 planets briefing (2)

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