Live coverage: Atlas 5 countdown and launch journal

Boeing and SpaceX are readying for launch abort tests in the coming weeks to validate the crew escape systems for the new human-rated Starliner and Crew Dragon spaceships, now scheduled to begin ferrying astronauts to the International Space Station in the first half of next year.

About a year and a half after signing a Space Act Agreement with NASA to develop a commercial space station, Northrop Grumman formally withdrew from its solo plans in order to partner with Nanoracks, a subsidiary of Voyager Space.

Wrapping up a busy week on the International Space Station, a crew of three boarded their Soyuz landing craft and headed for Earth on Friday. Cosmonaut Gennady Padalka, the most experienced space crewman in history, was at the controls, along with Danish and Kazakh crew members, and landed in Kazakhstan at 8:51 p.m. EDT Friday (0051 GMT Saturday).