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well, the space shuttles were safe, when they were first built 20 years ago. they're starting to find that the space shuttles are reaching the end of useful lives. sure, they maybe able to extend the useful lives of the space shuttles, but the bottom line is, nothing lasts forever. a space elevator could be started now, to replace the space shuttles in say, 5, 10 years. i think that would be reasonable time period, and in the end, a huge money saver.
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