VIDEO: Expedition 42-43 mission preview

Riding a specialized railroad car before dawn Friday, a Soyuz rocket rolled out of a cavernous assembly building and arrived at its launch pad at the Baikonur Cosmodrome in Kazakhstan for liftoff Sunday with American, Russian and Italian crew members heading for the International Space Station.

Astronauts on the International Space Station are eager to begin unpacking 2.6 tons of supplies and experiments — including a package of belated Christmas gifts — after delivery aboard a SpaceX Dragon cargo capsule Monday.

Astronauts Barry “Butch” Wilmore and Terry Virts floated outside the International Space Station Wednesday for the second of three spacewalks to help ready the complex for dockings by commercial crew capsules. Back inside the station’s airlock, Virts reported a small amount of water in his space helmet, but officials said he was not in any danger.