Short-lived radioisotopes such as aluminum-26 influenced early solar system heat, water retention and the formation of Earth-like rocky planets, according to meteorite analyses and models.

NASA announced the selection of industry proposals to advance technologies for the agency’s Habitable Worlds Observatory concept.

— -- 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 surface ...

NASA has taken a major step toward one of its most ambitious science goals as it searches for signs of life on planets beyond ...

This artist’s impression shows a sunset seen from the super-Earth Gliese 667 Cc. Astronomers have estimated that there are tens of billions of such rocky worlds orbiting faint red dwarf stars in the ...

Rogue planets — worlds that drift through space alone without a star — largely remain a mystery to scientists. Now, ...