The comet, named K2, is currently 1.5 billion miles from the sun, making it the most distant comet ever discovered to be moving towards Earth. Astronomers believe K2 came from the Oort Cloud, the giant shell of icy objects that surrounds the solar system. It was photographed by NASA’s Hubble Telescope earlier this year just beyond Saturn’s orbit, having travelled for millions of years from beyond the solar system.

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