GJ 1214b - A Super Water Planet - 40 Light Years from Earth

Credit: NASA, ESA, and D. Aguilar (Harvard-Smithsonian Center for Astrophysics)

GJ1214b, shown in this artist's view, is a super-Planet orbiting, every 38 hours, a red dwarf star, at a distance of 2 million kilometres, which makes it hot with an estimated temperature of 230 degrees Celsius.

Found in 2009, scientists said, last week, that new observations made with the Hubble Space Telescope showed that GJ 1214b is a water world enshrouded by a thick, steamy atmosphere, representing a new type of planet,  like nothing seen in the solar system or any other planetary system currently known.

Most of its mass is made of water. 

Located 40 light-years from our Planet, it's huge size is estimated in 2.7 times the Earth's diameter with as much as seven times Earth's weigh.  from here