Most Earth-Like Worlds Haven't Been Born Yet

With NASA’s Kepler mission still turning up cosmic wonders , and a slew of exoplanet-hunting scopes on deck , the chance of finding a second Earth has never seemed higher. And yet, time may be against us when it comes to meeting our squishy galactic brethren: according to a new theoretical study, 92% of Earth-like worlds haven’t been born yet.

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