
Astronomers at Cambridge have proposed that the galaxy may contain a vast and previously unrecognised population of habitable planets, characterised by a global liquid water ocean beneath a hydrogen atmosphere, that exist across a far wider range of stellar conditions than Earth-like worlds and that may be substantially easier to detect signs of life on than the Earth analogues that astronomers have been searching for over the past three decades
For most of the past sixty years, the search for life beyond Earth has been a search for places like Earth.














