KENNEDY SPACE CENTER, Fla.—Three Americans and one Canadian launched into orbit from Florida’s Space Coast on Wednesday, flying the most powerful rocket ridden by humans...
In addition to efficiency, a nuclear-electric propulsion system has the benefit of using conventional plasma thrusters. But instead of using solar power to energize the...
Planet Labs, one of the world’s leading commercial satellite imaging companies, said Friday it is placing a hold on releasing imagery of some parts of...