The Bad Astronomer writes: "In a cosmic two-fer, astronomers have found two planets about the same size as Earth orbiting the same star. The planets, dubbed Kepler-20e and Kepler-20f, are 11,100 and 13,200 km across, respectively, compared to 12,750 for Earth. Both orbit very close to their star and are far hotter than Earth, but are the smallest two exoplanets ever confirmed orbiting another Sun-like star. Interestingly, three other planets were found in this alien solar system, all of which orbit the star closer than Mercury orbits the Sun. This is yet another milestone in the search for an Earth-like planet orbiting in the habitable zone of a Sun-like star."