Published: 05/08/2012 05:59 PM EDT on SPACE.com
Light from an alien "super-Earth" twice the size of our own Earth has been detected by a NASA space telescope for the first time in what astronomers are calling a historic achievement.
NASA's infrared Spitzer Space Telescope spotted light from the alien planet 55 Cancri e, which orbits a star 41 light-years from Earth. A year on the extrasolar planet lasts just 18 hours.
The
planet 55 Cancri e was first discovered in 2004 and is not a habitable
world. Instead, it is known as a super-Earth because of its size: The
world is about twice the width of Earth and is super-dense, with about
eight times the mass of Earth. Full Read
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