Scientists find an alien world 'like no planet we know of'

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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.

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[NewsCopy]

This Week in Discovery News we recap a story about future zoos, magma on the moon and an exoplanet covered in water.

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