NASA's Kepler Space Telescope is an observatory in space dedicated to finding planets outside our solar system, particularly alien planets that are around the same size as Earth in the "habitable" regions of their parent star. read more
Kepler is a space observatory launched by NASA to discover Earth-size planets orbiting other stars. Named after astronomer Johannes Kepler, the spacecraft was launched on March 7, 2009, into an Earth-trailing heliocentric orbit. The principal investigator was William J. Borucki. read more
It's in an orbit slightly behind the Earth. Actually, the orbit is a tiny bit further from the sun than the earth is (about 1.3%), so its orbital period is about a week longer than Earth. read more