Progress 50, meanwhile, is delivering about 764 pounds (346 kilograms) of propellant, 110 pounds (50 kg) of oxygen and air, 926 pounds (420 kg) of water and about 3,000 pounds (1,360 kg) of spare parts, science gear and other supplies, according to a NASA description.
An unmanned Russian spacecraft carrying nearly 3 tons of supplies arrived at the International Space Station Monday (Feb. 11) less than six hours after blasting off.
The robotic Progress 50 resupply ship docked with the orbiting lab at 3:35 p.m. EST (2035 GMT) Monday after launching from Baikonur Cosmodrome in Kazakhstan at 9:41 a.m. EST (1441 GMT). Such unmanned cargo trips have traditionally taken about two days.
The Progress 50 spacecraft is packed with about 2.9 tons of supplies for the space station's six-man Expedition 34 crew. On Saturday (Feb. 9), the station astronauts discarded an older unmanned cargo ship, called Progress 48, in order to make room for Progress 50.
The outgoing Progress vehicle was filled with tons of trash and unneeded items and intentionally destroyed by burning up in Earth's atmosphere. [Space Station's Robot Cargo Ship Fleet (Photos)]
The Russian Federal Space Agency's Progress spacecraft are disposable vehicles similar in design to its three-segment Soyuz crew capsules, but with a propellant module in place of the central crew return capsule on the Soyuz.