First 'Alien Earth' Exoplanet Could Be Discovered In 2013 By Kepler Telescope, Astronomer Predicts
By: Mike Wall Published: 12/27/2012 12:08 PM EST on SPACE.com
"The first truly Earth-like alien planet is likely to be spotted next year, an epic discovery that would cause humanity to reassess its place in the universe.
While astronomers have found a number of exoplanets over the last few years that share one or two key traits with our own world — such as size or inferred surface temperature — they have yet to bag a bona fide "alien Earth." But that should change in 2013, scientists say.
"I'm very positive that the first Earth twin will be discovered next year," said Abel Mendez, who runs the Planetary Habitability Laboratory at the University of Puerto Rico at Arecibo."
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And once we discover a planet that has the same conditions as earth how will we know that there is advanced life there? The answer may be in part by looking for hairspray (?). This video from the Blue Marble Space Institute of Science explains the thinking.