US Postal Service drops new OSIRIS-REx stamp ahead of asteroid sample return

OSIRIS-REx is about to fling samples of the asteroid Bennu at Earth

What time is NASA's OSIRIS-REx asteroid sample return capsule landing on Sept. 24?

This weekend NASA will attempt a "highly choreographed" operation to deliver an ancient "grandfather rock," as the team calls it, to Earth. This piece of an asteroid could provide clues about how our solar system evolved, and is the largest sample ever collected from beyond the orbit of the Moon.