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.
Earth "Twin" is likely to be discovered in 2013.
Possibly Habitable Super-Earths
The first truly Earth-like alien planet is likely to be spotted in 2013, an epic discovery that would cause humanity to reassess its place in the universe.
16 New Super-Earths Just Discovered
"I'm very positive that the first Earth twin will be discovered in 2013," said Abel Mendez, who runs the Planetary Habitability Laboratory at the University of Puerto Rico at Arecibo.
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