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Space shuttle mission name?

Last mission was STS 121, next one is STS 115.

Why are they not in numerical order?

2 Answers

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  • 1 decade ago
    Favorite Answer

    Missions are numbered in the order they are planned. The flights, however, often go out of their original sequence.

  • Anonymous
    1 decade ago

    They are numbered in decending order. When they reach zero, the world will end.

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