Live coverage: Orion lands in Pacific

Lockheed Martin, the largest U.S. defense contractor, announced late Sunday that it has reached a deal valued at $4.4 billion to acquire Aerojet Rocketdyne, a supplier of engines to NASA’s Space Launch System moon rocket and United Launch Alliance’s Atlas, Delta, and Vulcan rockets.

An Ariane 5 rocket lifted off at 2143 GMT (5:43 p.m. EDT) Thursday from French Guiana with a pair of commercial TV broadcasting satellites for AT&T and Eutelsat.

Wrapping up a six-month mission in orbit, three Chinese astronauts departed the Tiangong space station Saturday and landed in the remote Gobi Desert of northwestern China at 6:33 p.m. EDT (2233 UTC).