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PolyCam, the largest of three cameras on the OSIRIS-REx mission, helped spot the asteroid Bennu from millions of miles away and will also serve as a microscope to explore the surface of the asteroid as the spacecraft gets closer. (Photo: Symeon Platts/UA) PolyCam, the largest of three cameras on the OSIRIS-REx mission, helped spot the asteroid Bennu from millions of miles away and will also serve as a microscope to explore the surface of the asteroid as the spacecraft gets closer.