This Nov. 16, 2018 image provided by NASA shows the asteroid Bennu.
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After a two-year chase, a NASA spacecraft arrived Monday at the ancient asteroid Bennu, its first visitor in billions of years. The robotic explorer Osiris-Rex pulled within 19 kilometers of the diamond-shaped space rock. Flight controllers applauded and exchanged high-fives once confirmation came through that Osiris-Rex made it to Bennu exactly one week after NASA landed a spacecraft on Mars.With Bennu some 122 million kilometers away, it took seven minutes for word to get from the spacecraft to flight controllers at Lockheed Martin in Littleton, Colorado.A Japanese spacecraft, meanwhile, has been hanging out at another near-Earth asteroid since June, also for samples.Osiris-Rex aims to collect at least 60 grams, or 2 ounces, of dust and gravel.
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