About 700 million years ago, Earth froze over so completely that even tropical oceans turned to ice, an episode scientists ...

Iron isotopes show that salty seawater pockets beneath the ice were as cold as −15°C.

Astronomers have pulled a frozen, Earth-sized world out of archival data from the retired Kepler Space Telescope, revealing a planet candidate that circles its star roughly once a year and could host ...

Scientists identify exoplanet candidate HD 137010 b, a possible Earth-size world orbiting a Sun-like star 146 light-years away ...