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| Since the beginning of the nation's history as an international space power, Americans have asked whether the benefits of exploring the universe outweigh the risks of transporting humans to a distant and harsh environment. |
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| As the United States anticipates a third era of human space flight beyond the generations of Apollo and the space shuttle, our past achievements can help us chart a viable course for the future. |
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| This policy toolkit highlights the economic, environmental, and national security advantages that a half-century of space exploration has delivered to the American people. |
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