제 2의 지구 찾기
제 2의 지구 찾기 2016.08.06. 14:10 (Kepler-186f, seen here in an artist's rendering and discovered in 2014 by a team of astronomers including SF State's Stephen Kane, is one of more than 200 "exoplanets" that researchers say lie within the "habitable zone" of their stars and could potentially have life. Credit: Danielle Futselaar) (This figure shows the habitable zone fo..