21 February 2012 Updated at 10:44 ET
Distant 'water-world' confirmed GJ 1214b orbits close to its host star, as this artist's impression shows
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Astronomers have claimed the existence of a new class of planet: a "water-world" with a thick, steamy atmosphere.
link-
http://www.bbc.co.uk/news/science-environment-17117030