An unpiloted ISS Progress resupply vehicle approaches the ISS, carrying 1,764 pounds of propellant, 110 pounds of oxygen and air, 926 pounds of water and 3,000 pounds of spare parts, experiment hardware and logistics equipment – 2.9 tons of supplies in all – for the Expedition 34 crew members. Progress 50 docked to the station's Pirs docking compartment on February 11, 2013. (Photo by NASA via The Atlantic)
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