SR-1 Freedom would start a 20-kilowatt-electric HALEU reactor after Earth escape, power a Hall thruster and deliver three SkyFall helicopters at Mars in 2029.
NASA has put a date on an idea that the United States has studied for more than six decades without sending beyond Earth orbit. The agency is targeting late 2028 for Space Reactor-1 Freedom, a roughl… [+11180 chars]