Sean Duffy wants to fast-track putting a 100kw nuclear reactor on the moon, according to a directive he sent out Thursday. It would help win the "space race."

Interim NASA Administrator Sean Duffy says his plan to put a nuclear reactor on the moon is part of his plain to "get there first and claim that for America."

Placing an atomic energy source on the lunar surface is “not science fiction,” experts say, but does pose technical challenges.