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Evidence Found for Undiscovered Comet That May Threaten EarthLess than 50% Ten years after launching, the European Space Agency Rosetta spacecraft caught up to its target: Comet 67P. In 2014, Rosetta, now 250 million miles from Earth, traveled along with the comet while it made its way around the Sun measuring its increased activity including classic comet tail formation as it approached the sun. At one point Rosetta detected and measured streams of water vapor spewing out of the comet at an estimated rate of 600 milliliters per second. A surprise meteor shower spotted in February was likely caused by cosmic "bread crumbs" dropped by an undiscovered comet that could potentially pose a threat to Earth, astronomers announced today (July 27). The tiny meteoroids that streaked through Earth's atmosphere for a few hours on Feb. 4 represent a previously unknown meteor shower, researchers said. The "shooting stars" arrived from the direction of the star Eta Draconis, so the shower is called the February Eta Draconids, or FEDs for short. The bits of debris appear to have been shed by a long-period comet. Long-period comets whiz by the sun very infrequently, so it's tough to predict when they last cruised through our neck of the woods — and when they'll come back, researchers said. [ link to www.space.com (secure)]
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