Kepler-186b, Kepler-186c, Kepler-186d, and Kepler-186e, orbit every three, seven, 13, and 22 days, respectively, making them very hot and inhospitable for life as we know it.

The early-17th-century astronomer Johannes Kepler defined the basic rules governing planetary motion. The basis for everything we understand about the orbits of the planets comes from the work of ...

Astronomers studying data from NASA's retired Kepler space telescope discovered a new system of seven "scorching" planets orbiting a distant star that is bigger and hotter than the sun, the space ...

Kepler stared at only a few small fields (blue) of about 116 square degrees each in the sky during its lifetime: one in Cygnus and several along the ecliptic plane.