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Soyuz 2A : ウィキペディア英語版
Soyuz 2A

Soyuz 2A is the unofficial designation for a cancelled space flight of the Soyuz spacecraft. It would have flown alongside the Soyuz 1 mission, except for a technical reasons the flight was cancelled, which resulted in saving the lives of the crew.
In the Soviet space program it was usual only for successful launches to gain official designations, so this mission did not receive an official designation and is informally named Soyuz 2A to distinguish it from the official Soyuz 2 mission, which was launched in October 1968 as an unmanned docking target for Soyuz 3.
==Situation==

Over two years had passed since the last manned Soviet space flight. To introduce the new Soyuz spacecraft, the Soviets planned an ambitious double mission, which would see the two spacecraft dock and exchange passengers. This was despite the failure of unmanned tests of the Soyuz spacecraft, which still contained flaws. Political pressure from the Soviet leadership meant the launch of Soyuz 1 went ahead in spite of these problems.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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