A NASA spacecraft has set a new milestone in cosmic exploration by entering orbit around an asteroid named Bennu. The asteroid is the smallest object ever to be circled by a man-made spaceship.

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The spacecraft OSIRIS-Rex is the first-ever US mission designed to visit an asteroid and return a sample of its dust back to Earth.

The $800 million unmanned spaceship launched two years ago from Cape Canaveral, Florida and arrived December 3 at its destination, some 70 million miles (110 million kilometers) away.