New 'super-Earth' is a steamy 'waterworld'

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New 'super-Earth' is a steamy 'waterworld'

An astronaut attempting to visit recently discovered planet GJ1214b would land in hot water -- literally, US scientists say. Researchers at the Harvard-Smithsonian Center for Astrophysics said they have identified an entirely new kind of planet, dominated not by rock, gas or other common materials, but water.