Scientists have discovered a planet only slightly larger than Earth in orbit around Alpha Centauri, only 4.37 light years from Earth (only Proxima Centauri is closer). The planet, which was discovered based on fluctuations in the star’s movement, orbits closer to its primary than Mercury does and completes an orbit every three days. The discovery was made using data from La Silla Observatory in Chile and will be officially announced in Nature on October 17.
Results from the first four months of observation from the Kepler space observatory have been released indicating the discovery of more than 1200 potential planets, including 165 Jupiter-class planets, 662 Neptune-class planets, 288 superEarth class planets, and 68 Earth-class planets, 54 of which are considered to be in the habitable zone. Kepler has been searching a portion of the sky that includes the constellation Cygnus and Lyra and looked at 156,000 stars during the period covered by the released data.