Kosmos 300
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Kosmos 300 was the fourth Soviet attempt at an uncrewed lunar sample return. It was probably similar in design to the later Luna 16 spacecraft. It was launched, on a Proton rocket, on September 23, 19
A Ye-8-5 model in the Museum of Cosmonautics, Moscow.
Blok D
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Blok D is an upper stage used on Soviet and later Russian expendable launch systems, including the N1, Proton-K and Zenit.
Comparison of Block D variants