This artist’s conception shows what the TRAPPIST-1 planetary system may look like, based on available data about their diameters, masses and distances from the host star.

This artist's concept shows what the TRAPPIST-1 planetary system may look like, based on available data about the planets’ diameters, masses, and distances from the host star. (NASA Image)

This artist's concept shows what the TRAPPIST-1 planetary system may look like, based on available data about the planets’ diameters, masses, and distances from the host star. (NASA Image)

This artist’s concept shows what the TRAPPIST-1 planetary system may look like, based on available data about the planets’ diameters, masses, and distances from the host star. (NASA Image)