On April 11, 1970, the Apollo 13 spacecraft was launched from Cape Canaveral, Fla., on the third U.S. moon-landing mission.

A nuclear fusion rocket could be the key to unlocking speedy flights in space exploration, and one company hopes to test it as early as 2027.

President Donald Trump nominated Isaacman to become NASA’s 15th administrator late last year. If confirmed, the tech entrepreneur would become the youngest person to lead the space agency that is ...