NASA’s Osiris-Rex spacecraft is asteroid Bennu’s first visitor in billions of years

Carbon-rich asteroid Bennu, which could hold evidence dating back to the beginning of our solar system 4.5 billion years ago, is an astronomical time capsule. After a two-year chase, a NASA spacecraft arrived on December 3 at the ancient asteroid Bennu, its first visitor in billions of years. The robotic explorer Osiris-Rex pulled within 19…