SpaceComet stinks of rotten eggs and cat wee, finds Rosetta Data from the European Space Agency's Rosetta probe reveals that eau de comet 67P/Churyumov-Gerasimenko smells awful – but that's good news News
EarthEarth's early life endured long asteroid bombardment Massive asteroids may have pounded Earth for a billion years longer than we thought – with early life forms suffering periodic melting of the surface News