Three great constants in life are death, taxes — and the costly rocket program that NASA always seems to have under development.
NASA's current rocket of the future is called the Space Launch System. It is a heavy-lift vehicle that replaced a similar program called Constellation proposed by the Bush administration.
Both are quite a bit like the National Launch System of the 1990s. And all have a distinct similarity to a rocket that once actually existed — the Saturn V used in the Apollo program.
Source : usatoday
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