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updated 7/27/2007 9:34:32 PM ET 2007-07-28T01:34:32

A deadly explosion at the test site of a pioneering company building commercial spaceships has cast light on inherent dangers in rocketry that have been overshadowed by public enthusiasm for the adventure of space tourism.

The accident, which killed three people, came nearly two years after Scaled Composites LLC first began designing its top-secret suborbital spaceship for British tycoon Richard Branson, who hopes to fly tourists by 2009.

Scaled, headed by aviation legend Burt Rutan, is best-known for its 2004 launch of SpaceShipOne, the first privately developed manned rocket to reach space.

The tragedy stunned space tourism supporters, many of whom were betting that Branson's Virgin Galactic spaceline would be the first in the fledgling business to send well-heeled tourists out of the atmosphere.

"I suspect that this is a major setback for Virgin Galactic, because they may have to go back to the drawing board for propulsion, for PR reasons if nothing else," former aerospace engineer and space tourism consultant Rand Simberg wrote on his blog Transterrestrial Musings.

The cause of Thursday's blast, which spewed nitrous oxide into the air, is still under investigation. Rutan said it occurred during a routine test of the propellant flow system for SpaceShipTwo, the commercial version of SpaceShipOne. The test was done at room temperature and under pressure, but did not require any rocket firing. Employees had performed the test numerous times before without any problem, Rutan said.

Killed were Eric Blackwell, 38, Charles May, 45, and Todd Ivens, 33, all employees of Scaled. May, who left the company after SpaceShipOne's history-making flights, had been back on the job for only four days when he was killed, said his brother, Gary May of suburban Dallas.

Some experts contend the accident should not cause a ripple effect across the budding industry because the spaceship designs under development by various companies use a range of rocket propulsion systems. If anything, the accident will bring more awareness about the dangers of handling rocket fuel.

SpaceShipTwo will be powered by a hybrid rocket motor that uses nitrous oxide as an oxidizer, which provides the oxygen that rocket fuel needs to burn.

"Accidents happen when you're working with chemicals," said Thomas Matula, assistant professor at University of Houston-Victoria. "They're in the test phase, and that's when you want to find the problems."

For the past half-century, governments and giant aerospace corporations have dominated space by rocketing satellites and astronauts into orbit. Failures in those programs have been reduced, but not eliminated. Now, early enthusiasm about the commercial spaceflight industry may be tempered with the realization that rocketry is hard.

But core advocates are undeterred.

Peter Diamandis, founder of the nonprofit X Prize Foundation that awarded SpaceShipOne $10 million, said the tragedy should not ground the SpaceShipTwo project.

"This was an industrial accident. This has nothing to do with spaceflight," he said. "I have complete confidence that they are building a safe and robust spaceship."

Both Rutan and Branson have publicly stressed that safety is their priority and that they will not fly passengers until the vehicle is thoroughly tested. Even with the public proclamations, the men diverge. Branson has said commercial flights will begin in 2009 while Rutan has not released a timetable.

The accident puts the famously secretive Rutan in an awkward position. The designer of the Voyager aircraft and other experimental vehicles has been known to shy from the limelight as he works in private at a Mojave Desert airfield that has morphed from an aircraft junkyard into a thriving alternative space industry.

The scant details of the explosion he provided to reporters is the most Rutan has ever said about a project that is still supposed to be under wraps. Rutan would not comment on how the accident would affect the development of SpaceShipTwo, which has several hundred reservations from people willing to pay $200,000 a piece.

Virgin Galactic president Will Whitehorn also declined to comment until Scaled completes its investigation.

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