Using nuclear energy in space

Two types are possible for using the nuclear energy for space applications. The most common is the production of electricity. This electricity can be used to supply the satellites, exploration vehicles, lunar or planetary bases and electrical propellers too. The second way to use the nuclear energy in the space is the thermal nuclear propulsion the nuclear reactor act then as simple thermal exchanger to a gas which will release later in a classical exhaust nozzle. These two applications which concern the two reactors of a very small size are represented here basing on two examples of leading projects in collaboration between CNES and CEA: ERATO as electric generator and MAPS for the thermonuclear propulsion. (author)