Q&A with Mark Mulqueen, Boeing’s space station program manager

Space station commander Scott Kelly and Kjell Lindgren carried out a busy but mostly trouble-free spacewalk Friday, routing ammonia coolant back to the prime radiator used by one of the lab’s solar arrays and bypassing a secondary radiator that was activated three years ago to help pinpoint a coolant leak.

Watch Falcon 9 lift off from Kennedy Space Center launch pad 39A on a space station resupply mission. The rocket’s first stage then returned to land at neighboring Cape Canaveral Air Force Station.

A Northrop Grumman Cygnus cargo ship arrive at the International Space Station Monday carrying around 4.1 tons of supplies, experiments and small research CubeSats. The automated spacecraft was captured by the station’s robotic arm at 4:10 a.m. EST (0910 GMT) Monday to close out a two-day flight from a launch pad in Virginia.