Watery Giant

Astronomers have found water vapor in the atmosphere of a giant planet outside our Solar System. The detection in the extrasolar planet HD 189733b was made using Nasa's powerful Spitzer Space Telescope and is reported in the journal Nature. The team looked for the signal of water absorption in starlight poking through the edges of the atmosphere when the planet passed in front of its star. It is only the second time water has been detected on an exoplanet.

HD 189733b orbits very close to its parent star

Water vapor found on exoplanet