SpaceX is about to launch its first astronauts, and the stakes for both NASA and Elon Musk's rocket company are epic

· SpaceX is about to launch its first people into orbit, an experimental flight of its new Crew Dragon spaceship.
· Astronauts Bob Behnken and Doug Hurley will pilot the mission, called Demo-2, but their safety is not all that's at stake for NASA and SpaceX.
· SpaceX has big plans for lunar and Mars exploration, yet needs to...