The Progress resupply vehicle is an automated, unpiloted version of the Soyuz spacecraft that is used to bring supplies and fuel to the International Space Station.
The Soyuz 2.1A converted the flight control system from analog to digital, which allowed launch from fixed platforms. It also allowed big fairings and payloads.
A Russian Progress cargo spacecraft is scheduled to launch to the International Space Station Wednesday, July 31. Live coverage of the resupply craft’s launch and docking will begin at 7:45 a.m. EDT on NASA Television and the agency’s website. The Progress 73 spacecraft will lift off at 8:10 a.m., on a Soyuz rocket from the Baikonur Cosmodrome in Kazakhstan (5:10 p.m. Baikonur time) loaded with almost three tons of food, fuel and supplies for the residents of the orbiting laboratory. The spacecraft will arrive at the station three hours after launch and connect to the Pirs docking compartment on the Russian segment of the complex. Rendezvous and docking coverage will begin at 10:45 a.m., with docking scheduled for 11:35 a.m.Progress Details
The Roscosmos State Corporation for Space Activities, commonly known as Roscosmos, is the governmental body responsible for the space science program of the Russian Federation and general aerospace research. Soyuz has many launch locations the Russian sites are Baikonur, Plesetsk and Vostochny however Ariane also purchases the vehicle and launches it from French Guiana.INFO WIKI