A steroid Bennu is a scientific gem, but a potentially dangerous one. No other space rock has A a higher known probability of hitting Earth in the next 200 years. NASA’s OSIRIS-REx asteroid-sampling mission will help scientists better understand how to protect humankind if Bennu’s trajectory were ever to intersect with that of our planet. Bennu, discovered in 1999, is a rare B-type asteroid that’s rich in carbon material believed to contain
