14. Alien Planet Found Around Nearest Star
Of the 100 exoplanets discovered in 2012, one rises above the rest.
Astronomers identified more than 100 more worlds around other stars in 2012, but one especially hit home—because it is right next door. Scientists have spent more than a decade probing for planets around Alpha Centauri, a trio of stars just 4.4 light-years away. In October, Xavier Dumusque at the Observatory of Geneva and colleagues described a slight wobble in Alpha Centauri B, caused by the tug of an Earth-mass planet orbiting every three days around that yellowish, sunlike star.