Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

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 ...

Rocky planets like our Earth may be far more common than previously thought, according to new research published in the journal Science Advances. It suggests that when our solar system formed, a ...

In a blow to anyone dreaming that complex life may exist elsewhere in the universe, a new study suggests we're unlikely to ...

If Earth-like planets require an extremely rare supernova encounter, then water-depleted rocky planets might be exceptional. But if cosmic-ray immersion is sufficient—and common—then the conditions ...