Astronomers discover a new Earth-sized world just 40 light years away – Sky & Telescope
Artist's illustration of a rocky planet with a reasonable atmosphere orbiting a red dwarf star.NASA / JPL-Caltech / R. Hurt (Caltech-IPAC) In searching for planets around other stars, astronomers often look for worlds that most closely resemble our own. The discovery of Gliese 12b, the closest transiting, temperate, Earth-sized planet found to date, promises possibilities