SpaceX crews are preparing to launch a national security mission for the U.S. Space Force involving a unique payload.

But safety must come first, say members of a Federal Aviation Administration advisory committee say. U.S. Space Force's X-37B reusable space plane is set to take off on its seventh mission on Dec. 7, ...

Nasa has been more circumspect, putting its estimate for a manned mission somewhere in the mid-2030s. But the successes of SpaceX's more prosaic work - resupply missions to the space station ...