Why do we not use nuclear energy to roam about in space and go the distance if it lasts long and needs minimum refueling?

Question

Why do we not use nuclear energy to roam about in space and go the distance if it lasts long and needs minimum refueling?

In: 4

Answer 1

as a rocket engine? you need something to push with, and the heat output of nuclear engines would need something to heat up, expand and expell to work.

​

their was some research into it, but the general dislike of nuclear stuff, plus better ROI on funding conventional engines, means it not really viable.

​

and, as others have said, we already use nuclear powered electrical systems in space.