K2

Artist's impression of HD 137010b. credit: NASA/JPL–Caltech/Keith Miller (Caltech/IPAC).)

A candidate for an Earth-sized exoplanet with a year's orbit – but a frozen world

A possible rocky planet, about 6% larger than Earth, appears to complete an orbit in about 355 days and receives only about 29% of the star's radiation that Earth receives - putting it on the verge of the "habitable zone"