Russia has been using variants of Proton rockets in its space program since 1965, and the design is showing its age. For starters, every launch is an environmental mess -- Proton uses toxic chemicals where newer rockets have moved on to cleaner fuels... 
https://ift.tt/2Pnippe support@endlesssupplies.ca (Endless Supplies .Ca) August 20, 2018 at 04:30AM
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