Is a very low powered fission reactor (~25kWe) feasible for powering a large (car sized) Lunar or Martian rover? Or is it impractical (today) due to weight, size, radiation, or another technical reason? I understand that radioisotope thermoelectric generators are planned for future Mars rovers. Is NASA even considering a fission rover option? It seems the 100x additional power that fission provides could be extremely useful for better mobility and experiments.