01/10/2009 05:12 am ET Updated May 25, 2011

Water Vapor Found On Alien Planet

The unequivocal signature of water vapor has been found on a planet beyond our solar system.

Using NASA's Spitzer Space Telescope, astronomers detected the steamy signature of water vapor in the light coming from a large exoplanet circling around a star about 63 light-years from Earth. Though it's not the first sign of water vapor around this planet, it's the strongest evidence yet.

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