The new nuclear thermal rocket concept will make it possible to transport humans to Mars, and back to Earth in 90 days. Nuclear thermal propulsion is not a new idea. In the 1970s' NASA planned for NERVA (Nuclear Energy Rocket Vehicle Application). NERVA rocket engine was the nuclear reactor. That reactor was in the combustion chamber of a quite conventional rocket engine. There were some tests for that engine in the Nevada desert in the 1970s'. But then the NERVA system closed. Nuclear thermal propulsion makes it possible to create nuclear-powered Moon and Mars shuttles. Nuclear thermal propulsion makes it possible to create flexible and powerful rocket shuttles. There could be two stages for nuclear thermal propulsion. First, the crew and passengers will shoot to the orbiter using a conventional space shuttle. Or they can use the laser-powered craft. Then the crew will transfer to the nuclear rocket. That kind of system can operate anywhere inside the asteroid belt. Nucle