FILE - This artist's rendering made available by NASA in July 2016 shows the mapping of the near-Earth asteroid Bennu by the OSIRIS-REx spacecraft. Scientists had thought the asteroid Bennu had wide, open areas to scoop up dirt and gravel. But on Tuesday, March 19, 2019, NASA announced the probe hasn’t found any big spots for sampling. (NASA/Goddard/University of Arizona via AP)
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