By Andy Pasztor 

NASA's planned launch of an initial, unmanned version of its Orion capsule from Florida's Cape Canaveral Air Force Station was delayed by weather and technical issues Thursday morning, but another attempt is planned for Friday.

Orion's launch would have marked the first test flight of a spacecraft the U.S. hopes to rely on for human exploration of the solar system in the next few decades.

Weather and technical issues stopped the countdown multiple times before and after the planned liftoff time of 7 a.m. EST and the launch was eventually scrubbed. Wind shifts and an errant boater who mistakenly entered the protected launch zone were responsible for some initial delays.

Automated fail-safe systems twice halted the countdown when sensors recorded excessive winds. Later, balky valves on the liquid-oxygen fuel system prompted another delay.

Featuring two orbits and scheduled to last less than five hours, the voyage was slated to take Orion some 3,600 miles above the earth, more than 10 times higher than the trajectory of the international space station. But it won't resolve long-standing questions about how future Orion missions will be paid for or even where they would go.

National Aeronautics and Space Administration officials describe the 11-foot long Orion, with its advanced onboard life-support systems and radiation shields, as the primary vehicle to transport future astronauts to asteroids and eventually to Mars, perhaps by the late 2030s. Yet so far, NASA's plans have failed to generate the international support, congressional consensus and public excitement back home that the agency expected.

It is unclear how NASA's budgets--already stretched by the international space station--over the next decade will cover Orion's development as well as a steady launch rhythm. Building and testing separate vehicles able to touch down at destinations is likely to cost billions of additional dollars. Debate also continues to simmer on Capitol Hill and elsewhere about whether astronauts should first take Orion near the moon to perfect propulsion, fueling, life-support and other essential technologies.

Orion illustrates the mercurial, sometimes roller-coaster nature of U.S. manned space efforts better than any other recent program.

The test would have been the first time since 1972, when Apollo 17 returned from the moon, that a spacecraft built to carry astronauts will venture beyond low-earth orbit.

The major goals of the test flight will be to assess how well Orion's navigation and electronics systems stand up to radiation, the performance of its heat shield and the way its parachutes are able to withstands re-entry speeds.

Built by Lockheed Martin Corp. and currently costing the National Aeronautics and Space Administration about $1 billion a year, NASA casts Orion as the key to deep-space ventures.

Write to Andy Pasztor at andy.pasztor@wsj.com

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