Companies in China, Turkey and Russia are increasingly producing armed drones, remotely piloted aircraft that can use guided weapons on and off the battlefield.
NASA’s experimental Deep Space Atomic Clock is now operating. It completed the commissioning phase of its journey in November. The instrument is one of several payloads on General Atomics’ Orbital Test Bed satellite (abbreviated OTB), which rode into orbit on a SpaceX Falcon Heavy rocket in June. General Atomics is based in La Jolla. Its Electromagnetic Systems unit, which...