NASA's Osiris-REx mission has successfully returned a pristine sample of asteroid back to Earth. This cupful-or-so of space rock could shed light on the solar system's origins.
NASA's first effort to retrieve samples from an asteroid will send a capsule that contains extraterrestrial pebbles and dust plunging towards a Utah desert on Sunday.
A NASA spacecraft sent out to collect rocks from an asteroid seems to have nabbed a lot of material, but there's now an unexpected problem — a flap isn't closing because some rocks are stuck.