Almost all satellites have some kind of thrusters aboard, but they tend to use them as little as possible to conserve chemical fuel. Reaction wheels are one way to make orientation adjustments without ...

DARPA is trying to use new more powerful superconducting magnets to triple the efficiency of a Magnetohydrodynamic drive for ultra-quiet navy ships. The PUMP program will develop an electrode material ...

Taking a plot point from the 1990 Sean Connery movie thriller The Hunt for Red October, DARPA is working on a super-silent submarine drive that has no moving parts and provides propulsion through the ...