Not too hot, not too cold, Gliese 581g orbits in the liquid-water temperature zone of a dim red-dwarf star just 20 light-years away.
The best place to look for nearby Earth-size planets are around the smallest, coolest stars. New research shows that any exoplanets tightly circling their stars might have a better chance of being habitable than previously thought.
The commonest stars in the universe aren't very Sun-like but they could still have life-bearing planets. However, those worlds aren't like anything you've ever seen. Imagine a home world where half of the planet basks in eternal day, the other cloaked in eternal night.
A new study of data archived from the Galaxy Evolution Explorer (GALEX) spacecraft is revealing just how hard life might be on planets like those in the TRAPPIST-1 system.
Two astronomers report that small, dim red-dwarf stars are far more abundant in elliptical galaxies than thought — so much so that the total number of stars in the universe is likely three times higher than previous estimates.
Kapteyn’s star — a nearby star that likely formed outside this galaxy — hosts two planets more than twice as old as Earth.