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Obama's plan for America's space program, according to early reports, represents a fundamental shift for human spaceflight, some experts say.
Researchers and space enthusiasts seehelium 3 as the perfect fuel source: extremely potent, nonpolluting, withvirtually no radioactive by-product. Proponents claim its the fuel ofthe 21st century. The trouble is, hardly any of it is found on Earth.But there is plenty of it on the moon.