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."

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

The reactor would launch to the moon by 2030, according to a directive by acting NASA Administrator Sean Duffy that was sent to NASA officials in July and obtained by NPR. It's an ambitious target that has some in the scientific community concerned about high costs and a potentially unrealistic schedule.