ELI5: Explain Like I'm 5

Nuclear salt-water rocket

A nuclear salt-water rocket is a type of rocket engine that uses nuclear energy (the same kind of energy used to power some nuclear power plants) to heat salt water until it turns into steam. The steam is then used to push the rocket forward. The engine can be very powerful and efficient since the nuclear energy it uses can produce a lot of heat. The rocket is also very safe since the salt water acts like a shield protecting the engine from radiation.