Video: Narrated preview of Jan. 6 spacewalk

Japan’s space agency has set Sept. 30 as the target launch date for the country’s sixth resupply mission to the International Space Station, carrying cargo, experiments and six lithium-ion batteries to kick off a major upgrade of the lab’s electrical system.

Astronauts Peggy Whitson and Jack Fischer put on spacesuits Friday and headed outside the International Space Station for several repair and maintenance tasks, but the duo only completed part of their originally planned work after a leaky cooling umbilical delayed the start of their 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.