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Wow!
 
Steamy waterworld found around a nearby star

A planet discovered in 2009 orbiting a star just 40 light years away apparently has an atmosphere that's primarily water vapor! Hubble observations indicate the atmosphere may be up to 50% water by mass, which at the planet's temperature (230 Celsius,ouch!) would be steam. This planet is a Super-Earth, more massive and bigger than our home world, but still far smaller than gas giants like Jupiter. It's inhospitable to be sure, but also a nice reminder that water is everywhere in the cosmos.

More info: http://blogs.discovermagazine.com/badastronomy/2012/02/21/super-earth-exoplanet-likely-to-be-a-waterworld/
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