Kepler-22b

This diagram compares our own solar system to Kepler-22, a star system containing the first "habitable zone" planet discovered by NASA's Kepler mission. The habitable zone is the sweet spot around a star where temperatures are right for water to exist in its liquid form. Liquid water is essential for life on Earth.

Kepler-22's star is a bit smaller than our sun, so its habitable zone is slightly closer in. The diagram shows an artist's rendering of the planet comfortably orbiting within the habitable zone, similar to where Earth circles the sun. Kepler-22b has a yearly orbit of 289 days. The planet is the smallest known to orbit in the middle of the habitable zone of a sun-like star. It's about 2.4 times the size of Earth.
Image credit: NASA/Ames/JPL-Caltech

Kepler Planet Sizes Comparative sizes of Kepler planets, through Kepler-22b.

Credit: NASA/Kepler mission/Wendy Stenzel

Kepler Mission Manager Update - 503 New Planet Candidates

Kepler-22b is an extrasolar planet orbiting G-type star Kepler-22.^[7][8] It is located 600 light years away from Earth in the constellation of Cygnus. It was discovered by NASA's Kepler Space Telescope in 2011 and was the first known transiting planet to orbit within the habitable zone of a Sun-like star.^[7][8]