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.

NASA has been working behind the scenes for years to develop compact nuclear power systems designed to support lunar bases, resource extraction, and extended human stays on the Moon.