Main article: Vision for Space Exploration United States President George W. Bush announced an initiative of manned space exploration on January 14, 2004, known as the Vision for Space Exploration. It included developing preliminary plans for a lunar outpost by 2012[23] and establishing an outpost by 2020. Precursor missions that would help develop the needed technology during the 2010-2020 decade were tentatively outlined by Adringa and others.[24] On September 24, 2007, Michael Griffin, then NASA Administrator, hinted that NASA may be able to launch a human mission to Mars by 2037.[25] The needed funds are to be generated by diverting $11 billion[26] from space science missions to the vision for human exploration.
NASA has also discussed plans to launch Mars missions from the Moon to reduce traveling costs.[27]
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