NASA's Kepler space observatory. NASA

NASA’s Planet-Hunting Kepler Spacecraft Has Another Look at TRAPPIST-1 as It Runs Out of Fuel

TRAPPIST-1 made international headlines last year when astronomers confirmed that seven rocky, Earth-like planets were orbiting it.

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, as of February 2018. NASA/JPL-Caltech
An artist's concept of GJ 9827 with three super-Earths in orbit. | ESO
This artist concept shows K2-138, the first multi-planet system discovered by citizen scientists. NASA/JPL-Caltech