Acting NASA Administrator Sean Duffy has directed the agency to fast-track plans to put a nuclear reactor on the moon.

The acting administrator of NASA, Sean Duffy, announced a directive to build a powerful nuclear reactor on the moon, but it is unclear what it would power – or even if his plan is legal

Nuclear power on the moon is critical to the United States' space exploration and national security goals, and the U.S. government should "move quickly" to build reactors there before its terrestrial rivals, according to a directive issued by Transportation Secretary and acting NASA Administrator Sean Duffy, which was obtained by ABC News.