Making the Case for Human Missions to Asteroids, Space Quarterly
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"By Jeff Foust
When President George W. Bush unveiled the Vision for Space Exploration in January 2004, he outlined a series of destinations for human exploration: a return to the Moon by 2020, followed by expeditions at later, unspecified dates "to Mars and to worlds beyond". This "Moon, Mars, and beyond" concept made logical sense as a set of stepping stones for human expansion into the solar system, even if the "beyond" part was vague in terms of specific destinations and timetables."