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After a two-year chase, a NASA spacecraft has arrived at the ancient asteroid Bennu, its first visitor in billions of years.The $800 million mission, known as OSIRIS-REx, will use its suite of five science instruments to study the asteroid for the next year and a half.Bennu is a carbon-rich asteroid, chosen from some 500,000 asteroids in the solar system because it orbits close to Earth's path around the Sun, is the right size for scientific study, and is one of the oldest asteroids known to NASA.
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