VIDEO: Expedition 42-43 mission preview

Check out photos taken by two astronauts who ventured outside the International Space Station on Saturday, running more than 300 feet of wiring that will eventually be connected to new docking ports to receive commercial spaceships built by Boeing and SpaceX.

A Russian Progress supply ship packed with 3.1 tons of cargo and propellant to refuel the International Space Station is set for liftoff Tuesday from the Baikonur Cosmodrome in Kazakhstan.

Three crew members departed the International Space Station on Wednesday and descended back to Earth, touching down in Kazakhstan aboard the Soyuz TMA-14M capsule at 10:08 p.m. EDT (0208 GMT Thursday).