Video: Narrated preview of Jan. 6 spacewalk

Space station commander Scott Kelly and flight engineer Kjell Lindgren are gearing up for their second spacewalk in nine days Friday, a planned six-and-a-half-hour excursion to reconfigure the ammonia cooling system used by one of the lab’s sets of solar arrays.

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.

Struggling with balky electrical connectors, spacewalker Mike Hopkins managed to plug in and secure three of four thick power and data cables Saturday that are needed by a European experiment platform, leaving one cable for additional troubleshooting.