Photo: "Rocket NASCAR," Moon Base Part of 50-Year Space Vision

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From right to left, U.S. Apollo astronaut Buzz Aldrin, X Prize Foundation vice-chair Bob Weiss, Google co-founder Larry Page, and X Prize Foundation chair Peter Diamondis take questions during a press briefing to announce the 30-million-U.S.-dollar Google Lunar X Prize on September 13, 2007.

The newest X Prize is among the host of private and government efforts to put humans back on the moon, a possible first step toward a future vision of space exploration that includes rocket racers, tourist spaceports, and Martian colonies.

Photograph by Ric Francis/AP

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