#NASA will announce that TRAPPIST-1 has 7 Earth-sized planets - 6 within/close to star's habitable zone #astrobiology #extrasolar #astronomy pic.twitter.com/wypBTSfAWG— NASA Watch (@NASAWatch) February 21, 2017
#NASA will announce that TRAPPIST-1 has 7 Earth-sized planets - 6 within/close to star's habitable zone #astrobiology #extrasolar #astronomy pic.twitter.com/wypBTSfAWG