The TRAPPIST-1 system contains a total of seven planets, all around the size of Earth. Three of them — TRAPPIST-1e, f and g — dwell in their star’s so-called habitable zone. – NASA

Related channels: EXOPLANETSKEPLER SPACE TELESCOPE, SPITZER SPACE TELESCOPESETI INSTITUTE, SPACE COLONIZATIONALPHA CENTAURI, THE MILKY WAYRADIO ASTRONOMY