This story is everywhere today, but my preferred source for the real unsensationalised science behind astronomy headlines is Centauri Dreams, which explains that, while there is indeed water in the atmosphere of exoplanet HD 189733b, it’s almost certainly not in the liquid form that we are used to finding it in. The good news is that it suggests water-abundant star systems are not a rarity – so maybe one day we’ll find a planet more like our own.