Space Station Live: January 4, 2016

Wrapping up SpaceX’s fourth operational resupply flight to the International Space Station, a Dragon cargo capsule departed the high-flying research complex, dropped out of orbit and descended to a parachute-assisted splashdown in the Pacific Ocean with nearly 3,300 pounds of biological specimens and hardware.

Astronauts Barry “Butch” Wilmore and Terry Virts floated outside the International Space Station Saturday and installed wiring needed for two new docking mechanisms that will be attached later this year for use by Boeing and SpaceX crew capsules.

Two NASA astronauts and an Italian flight engineer are sheltering in the space station’s Russian segment as mission control analyzes a possible leak of toxic ammonia coolant aboard the complex.