Where to look for extraterrestrial life

The universe may be teeming with life, but we have yet to find any beyond Earth. These are the best prospects, says Stephen Fleischfresser.

An artist's impression of a view of the surface of the planet Proxima b orbiting the red dwarf star Proxima Centauri, the closest star to the Solar System. Proxima b is a little more massive than the Earth and orbits in the habitable zone around Proxima Centauri, where the temperature is suitable for liquid water to exist on its surface. Credit: ESO