Space Telescope Offers Rare Glimpse Of Earth-Sized Rocky Exoplanet
The planet lies about 48.6 light years from Earth and is one of more than 4,000 so-called exoplanets identified over the past two decades circling distant stars in our home galaxy, the Milky Way.
An artist's conception shows NASA's Spitzer Space Telescope on Oct. 1, 2016.
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