OSIRIS-REx is NASA's mission to explore asteroid Bennu.
Its goal is to collect a sample of Bennu and return it to Earth.
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To get to Bennu, OSIRIS-REx must first match the asteroid's
orbital tilt.
In September 2017, it will approach Earth
for a gravity assist,
bringing the spacecraft within 11,000 miles of home.
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Following the flyby, OSIRIS-REx will look back at Earth.
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It will take images and spectra of our world,
calibrating its instruments so that they are ready
to study Bennu.
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The gravity assist will change OSIRIS-REx's orbital tilt
by six degrees,
sending it on a path to catch asteroid Bennu in 2018.
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