"Since its debut two weeks ago, approximately 7.5 million people have visited the Web site of Virgin Galactic, a space travel venture founded by British airline and entertainment magnate Sir Richard branson. Around 3,500 of those visitors said they are willing to pay a deposit as soon as flights are available, said Will Whitehorn, a Virgin spokesman.

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"Seventy-eight percent of the registrants were from the U.S., with the rest split evenly among England, Germany, Japan and Australia," he added. "And the gender, as far as we could tell, was 58 percent male, which was less skewed than I expected."

The age range of interested space travelers also was quite wide--from people in their 20s to 60s. "