LOS ANGELES (AP) -- Brian Emmett's childhood fantasy came true when he won a free trip to outer space. He was crushed when he had to cancel his reservation because of Uncle Sam.

Emmett won his ticket to the heavens in a 2005 sweepstakes by Oracle Corp., in which he answered a series of online questions on Java computer code. He became an instant celebrity, giving media interviews and appearing on stage at Oracle's trade show.

For the self-described space buff who has attended space camp and watched shuttle launches from Kennedy Space Center, it seemed like a chance to become an astronaut on a dime.

Then reality struck. After some number-crunching, Emmett realized he would have to report the $138,000 galactic joy ride as income and owe $25,000 in taxes. Unwilling to sink into debt, the 31-year-old software consultant from the San Francisco Bay area gave up his seat. "There was definitely a period of mourning. I was totally crestfallen," Emmett said. "Everything you had hoped for as a kid sort of evaporates in front of you."

With commercial spaceships still under development, it's uncertain when the infant space tourism industry will actually get off the ground. Still, ultra-rich thrill-seekers are already plunking down big — though refundable — deposits to experience a few minutes of weightlessness 60 miles above Earth.

And in recent years, space tourism companies have teamed with major corporations to stage contests with future suborbital spaceflights as the grand prize.

The partnerships have interstellar hype — but as Emmett found out, they can get mired in that most earthbound hassle: taxes. "From a consumer perspective ... I'd be wary," said Kathleen Allen, director of the University of Southern California's Marshall Center for Technology Commercialization. "I'd check to see the fine print."