Time-lapse: The Falcon 9 and Crew Dragon roll to the launch pad (members only)

NASA expects to select commercial contractors to resupply the International Space Station in September, three months later than the agency’s previous timetable under a competition for cargo deliveries beginning in 2018.

With one last task to carry out, a space station Cygnus cargo ship loaded with trash and no-longer-needed equipment fell back to Earth Wednesday, hitting the discernible atmosphere 60 miles or so above the Pacific Ocean at nearly 5 miles per second.

A Russian Progress cargo ship glided to a smooth docking with the International Space Station early Sunday, bringing more than 3 tons of supplies and equipment to the lab complex.