How much asteroid material is NASA's OSIRIS-REx probe delivering to Earth this weekend?
NASA's OSIRIS-REx mission is delivering a precious haul of asteroid dirt and gravel to Earth this weekend. How much of this space-rock stuff will there be?
TroibNews 
NASA's OSIRIS-REx mission is delivering a precious haul of asteroid dirt and gravel to Earth this weekend. How much of this space-rock stuff will there be?
