Giant old galaxies, not Milky Ways, are best for life to thrive #RosettaWatch: Philae lander reveals comet 67P’s fluffy surface Ancient crystals show Earth’s magnetic field switched on early In So Many Words: Minute world with big stories to tell Home, sweet exomoon: The new frontier in the search for ET Is Pluto a planet or a dwarf? Such labels matter less and less Neptune’s sudden jolt could explain weird ring in Kuiper belt Clusters of living worlds would hint life came from outer space New Horizons spots oozing glaciers and hazy skies on Pluto SpaceShipTwo crash due to lax safety oversight say investigators What would happen if a massive comet crashed into the sun? In so many words: Don’t kill small-life before Red World trip Bahamian paradise viewed from space captures ocean in motion Earth-like alien world looms into view through Kepler telescope Pluto’s baffling surface reveals mysteries of an active world Behind-the-scenes photos show the people that got us to Pluto Quantum of solace – information can be rescued from a black hole Philae may have moved – and Rosetta will start to look south $100m project uses world’s best radio telescopes to find aliens New Horizons team baffled by discovery of icy plains on Pluto