Dubbed ‘Earth’s seven sisters’, the rocky exoplanets could potentially harbour liquid water.
Astronomers have found an Earth-like planet orbiting our nearest neighbour, the red dwarf star Proxima Centauri. So any chance that planet may be habitable?
The red hue of the Moon during a total lunar eclipse gives astronomers a clue on how to find out more about the planets being discovered around other stars.
NASA’s Hubble telescope has made the first atmospheric study of two Earth-sized planets outside our Solar System.