Video: Soyuz MS-01 leaves the space station for landing

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.

Amid a Russian spacewalk to carry out routine maintenance and inspections outside the International Space Station, two NASA astronauts and a Japanese crewmate staged a culinary first in orbit — harvesting and eating a few leaves of leafy, space-grown red romaine lettuce.

United Launch Alliance has begun stacking its first Atlas 5 rocket to fly in service to the International Space Station, a commercial mission to send supplies to the orbiting complex.