This artist’s impression shows a sunset seen from the super-Earth Gliese 667 Cc. The brightest star in the sky is the red dwarf Gliese 667 C, which is part of a triple star system. The other two more distant stars, Gliese 667 A and B appear in the sky also to the right. Astronomers have estimated that there are tens of billions of such rocky worlds orbiting faint red dwarf stars in the Milky Way alone.
Illustration credit: ESO/L. Calçada
Note: For more information, see Many Billions of Rocky Planets in the Habitable Zones around Red Dwarfs in the Milky Way.