Proton (Russian: Протон, formal designation: UR-500) is a Russian hypergolic propellant expendable launch system operated by Roscosmos for commercial and state payloads. Developed by the Soviet space program, its first launch, a Proton-K variant, was in 1965.
Proton (Russian: Протон, formal designation: UR-500) is a Russian hypergolic propellant expendable launch system operated by Roscosmos for commercial and state payloads. Developed by the Soviet space program, its first launch, a Proton-K variant, was in 1965.
Source: Wikipedia "Proton (rocket family)" · CC BY-SA 4.0
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