Sunder Posted December 27, 2017 Posted December 27, 2017 (edited) Proton is an exendable launch system used for both commercial and Russian government space launches. The first Proton rocket was launched in 1965. Modern versions of the launch system are still in use as of 2017, making it one of the most successful heavy boosters in the history of spaceflight. Proton Rocket (UR-500) by Sunder_59, on Flickr Edited December 27, 2017 by Sunder Quote
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