WASHINGTON — The United States is rushing to put nuclear power reactors on the Moon and Mars, and hopes to launch the first ...

Lockheed Martin was awarded a contract by federal agency DARPA in partnership with NASA to build out an experimental nuclear-powered spacecraft that aims to make trips to the moon and Mars more ...

I N THE DEPTHS of the cold war, American spooks and generals came to suspect that the nuclear-weapons club was about to gain an incongruous new member. That state was Sweden, a neutral power that ...