A rough guide to the history of space shuttle replacements and evolutions which never came into being because of politics, budgets and (very rarely) technical problems.
Sources:
astronautix.com/
nasaspaceflight.com
nasawatch.com/
en.wikipedia.org/wiki/Shuttle...
Негізгі бет Ғылым және технология Why The US Took So Long To Replace Space Shuttle's Crew Capability
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