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Craft spies interesting gullies on asteroid Vesta

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PASADENA, Calif. (AP) — Scientists are puzzling over the discovery of gullies inside young craters on the giant asteroid Vesta. NASA's Dawn spacecraft spied two types of channels on the crater walls of the second-largest object in the asteroid belt. The first kind — short and straight — were likely carved by dry material flowing down the depression. But researchers are stumped by the appearance...

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