(Space.com) Scientists have discovered a new type of alien planet — a steamy waterworld that is larger than Earth but smaller than Uranus.  

The standard-bearer for this new class of exoplanet is called GJ 1214b, which astronomers first discovered in December 2009. New observations by NASA’s Hubble Space Telescope suggest that GJ 1214b is a watery world enshrouded by a thick, steamy atmosphere.

“GJ 1214b is like no planet we know of,” study lead author Zachory Berta of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., said in a statement. “A huge fraction of its mass is made up of water.”

Read more at Space.com, here

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