University of Liege in Belgium Astronomer Michael Gillon 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) More: exoplanets.nasa.gov/trappist1/ ( https://exoplanets.nasa.gov/trappist1/ )

University of Liege in Belgium Astronomer Michael Gillon 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) More: exoplanets.nasa.gov/trappist1/ ( https://exoplanets.nasa.gov/trappist1/ ) Stock Photo

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J330CH

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1597 x 1565 px | 27 x 26.5 cm | 10.6 x 10.4 inches | 150dpi

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22 February 2017

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RMHT4KH7–Astronomer Michael Gillion of the University of Liege in Belgium presents research findings during a TRAPPIST-1 planets briefing at the NASA Headquarters February 22, 2017 in Washington, DC. Researchers revealed the first known system of seven Earth-size planets around a single star called TRAPPIST-1.

RMJ330CF–University of Liege in Belgium Astronomer Michael Gillon 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) More: exoplanets.nasa.gov/trappist1/ ( https://exoplanets.nasa.gov/trappist1/ )

RMHT4KH8–University of Liege in Belgium Astronomer Michael Gillion presents research findings during a TRAPPIST-1 planets briefing at the NASA Headquarters February 22, 2017 in Washington, DC. Researchers revealed the first known system of seven Earth-size planets around a single star called TRAPPIST-1.

RMJ330D0–Manager of NASA's Spitzer Science Center at Caltech/IPAC, Pasadena, California Sean Carey, left, and University of Liege in Belgium Astronomer Michael Gillon, present 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) More: exoplanets.nasa.gov/trappist1/ ( https://exoplanets.nasa.gov/trappist1/ )

RMJ330CD–NASA Public Affairs Officer Felicia Chou, right, moderates a TRAPPIST-1 planets briefing with presenters, from left, Astronomer at the Space Telescope Science Institute in Baltimore Nikole Lewis, Professor of planetary science and physics at Massachusetts Institute of Technology, Cambridge, Sara Seager, Manager of NASA's Spitzer Science Center at Caltech/IPAC, Pasadena, California Sean Carey, University of Liege in Belgium Astronomer Michael Gillon, and NASA Associate Administrator of the Science Mission Directorate Thomas Zurbuchen, Wednesday, Feb. 22, 2017 at NASA Headquarters in Washington.

RMJ330CP–TRAPPIST-1 planets briefing with presenters, from left, Astronomer at the Space Telescope Science Institute in Baltimore Nikole Lewis, Professor of planetary science and physics at Massachusetts Institute of Technology, Cambridge Sara Seager, Manager of NASA's Spitzer Science Center at Caltech/IPAC, Pasadena, California Sean Carey, University of Liege in Belgium Astronomer Michael Gillon, and NASA Associate Administrator of the Science Mission Directorate Thomas Zurbuchen, Wednesday, Feb. 22, 2017 at NASA Headquarters in Washington. Researchers revealed the first known system of seven Earth-si

RMJ330CG–Manager of NASA's Spitzer Science Center at Caltech/IPAC, Pasadena, California Sean Carey, left, University of Liege in Belgium Astronomer Michael Gillon, center, and NASA Associate Administrator of the Science Mission Directorate Thomas Zurbuchen present 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) More: exoplanets.nasa.gov/trappist1/ ( https://exoplanets.nasa.gov/trappist1/ )

RMJ330CT–Manager of NASA's Spitzer Science Center at Caltech/IPAC, Pasadena, California Sean Carey, left, University of Liege in Belgium Astronomer Michael Gillon, center, and NASA Associate Administrator of the Science Mission Directorate Thomas Zurbuchen present 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) More: exoplanets.nasa.gov/trappist1/ ( https://exoplanets.nasa.gov/trappist1/ )