Live coverage: Atlas 5 countdown and launch journal

The U.S. Air Force’s fourth new-generation SBIRS missile warning satellite is headed for geosynchronous orbit after lifting off from Cape Canaveral at 7:48 p.m. EST Friday (0048 GMT Saturday), after a one-day delay caused by a troublesome fill-and-drain valve.

Blue Origin has partnered with Lockheed Martin and Northrop Grumman to build elements of the company’s human-rated lunar lander, and Draper will lead development of the lander’s avionics and guidance systems, with an aim to be ready to land a crew on the moon by 2024, company founder Jeff Bezos announced Tuesday.

Leaving six crewmates behind in orbit, a Russian commander, his NASA co-pilot and a first-time flier from the United Arab Emirates undocked from the International Space Station early Thursday, executed a fiery plunge back to Earth and landed safely on the steppe of Kazakhstan.