Video: NASA officials preview space station battery replacement spacewalks

Two astronauts worked outside the International Space Station Wednesday to reposition two spare solar array ammonia coolant pump assemblies, putting a failed unit, dubbed “Leaky,” into long-term storage and attaching another, known as “Frosty,” to an appendage of the lab’s robot arm.

Watch a replay of the landing of Oleg Novitskiy and Thomas Pesquet inside the Soyuz MS-03 crew capsule on the Kazakh stepped Friday, ending their six-and-a-half month expedition on the International Space Station.

Two astronauts floated outside the International Space Station Sunday for the first in a series of spacewalks to upgrade the lab’s aging solar power system, assembling a support fixture that eventually will hold a new solar blanket.