Astronomers in Japan have published their theory of an “Earth-like planet,” dubbed Planet Nine, that’s hiding in plain sight just a few billion miles behind Neptune. Published last month in ...

151; -- Astronomers on Monday reported the discovery of an Earth-like planet outside the solar system whose size and distance from its own star put it in the "habitable" zone and make for a ...

This artist's concept depicts one possible appearance of the planet Kepler-452b, the first near-Earth-size world to be ... It is a G2-type star like our sun, with nearly the same temperature ...