The space race is on — but this time it will be between American rocket companies. Sean Duffy, the acting NASA administrator, said in a Monday interview on "Fox & Friends" that Elon Musk's SpaceX is "behind schedule" on the Artemis III project, the mission that plans to land NASA astronauts back on the moon. SpaceX, which Duffy said was an "amazing company" that does "remarkable things," dominates the space rocket industry and has become one of the most valuable private companies in the world,