Live coverage: International Space Station crew lands in Kazakhstan

The run-through simulated day-of-launch activities, included suit up, ingress into the Orion spacecraft and a countdown that stopped just shy of T-0.

Concern about a possible ammonia coolant leak Wednesday prompted astronauts on the International Space Station to evacuate the U.S. segment of the complex and shelter in the Russian portion of the outpost while flight controllers scrambled to untangle initially confusing telemetry.

A Soyuz FG rocket thundered to life and shot into orbit smoothly Monday carrying three crew members on a six-hour flight to the International Space Station. The problem-free ascent came less than two months after an Oct. 11 launch abort that forced a different crew to carry out safe-but-scary emergency landing.