As NASA worries that China will win the next moon race, Elon Musk and his company tangled with critics.
NASA wants ideas of how to speed up the return of its astronauts to the surface of the moon. And now, it has some.
On Wednesday, the space companies owned by two of the richest people on Earth — Elon Musk’s SpaceX and Jeff Bezos’ Blue Origin — submit... [5393 chars]