This story was updated at 12:50 p.m.
CAPE CANAVERAL, Fla. - A one-of-a-kind NASA rocket soared into the Florida sky Wednesday in a brief but critical test flight of a new booster slated to launch astronauts into space and, eventually, toward the moon.
NASA's Ares I-X booster, an unmanned prototype of the planned Ares I rocket intended to carry astronauts after the space shuttle fleet retires, blasted off on an experimental mission from the seaside Launch Pad 39B here at the Kennedy Space Center (KSC).
"I can't tell you how proud I am of all of ya," KSC director Bob Cabana told the launch team after liftoff. "That was just unbelievable, it was spectacular. I got tears in my eyes."
After several false starts due to bad weather, the rocket took advantage of a brief break in the clouds to loft at 11:30 a.m. EDT (1530 GMT). Foul weather and a series of unlucky events foiled its first launch attempt Tuesday. NASA required good visibility for this first flight of the untried rocket.
"Think about what we just did," said launch director Ed Mango after the liftoff. "Our first flight test and the only thing we're waiting on was weather. That says you all did frickin' fantastic," he told the team.
The rocket lifted off despite a bout of thunderstorms that passed over it Tuesday night. About 150 lighting strikes were seen to fall near the site, with four lightning impacts within about a half mile of the launch pad. The countdown toward liftoff was delayed Wednesday morning while ground crews checked out the vehicle to make sure it suffered no lightning damage; luckily, the tests showed Ares I-X was safe to fly.
"We looked at all the systems that could have been affected by this and all the data indicates that there was absolutely no real effect," Ares I-X deputy mission manager Jon Cowart said Wednesday morning.
The towering white booster rose into the sky toward the east, peaked at about 28 miles (45 km) altitude, then dropped into the Atlantic Ocean, with parachutes softening its fall. By all appearances, the launch ? which was aimed at demonstrating the rocket's design - was successful.
Wealth of data
The mission is expected to return a wealth of data - readings from more than 700 onboard sensors as well as visual evidence from cameras on the ground and borne by flying aircraft. NASA engineers will pore over the information to study the rocket's trajectory and performance to help confirm and shape the design of Ares I.
"It's a huge amount of data," said Bob Ess, Ares I-X mission manager. "It's reams and reams of data that will take at best months to go through and understand."
The teams plan to release periodic reports over the next three months to share the results of the fact-finding test flight. "We'll come back and tell the agency and the public what we learned from the flight," Ess said.
Tuesday's launch plans were stymied by clouds, winds and the threat of rain. If the rocket travels through high clouds it runs a risk of triggering "trioboelectrification" - static electricity that could interfere with sensitive onboard instruments. In addition to weather concerns, a stuck cover on one of the rocket's probes stalled Tuesday morning, further delaying the countdown, and a freight boat later strayed into restricted waters close to the launch pad, thwarting one launch attempt.
The Ares I-X rocket was composed of a real first stage, with four tuna can-shaped solid-rocket segments and a dummy fifth segment on top. It also carried a simulated upper stage and crew capsule to mimic the intended size and mass of a full Ares I booster. At 327 feet (100 meters) high on the launch pad, it was the tallest rocket in service today, however brief its two-minute flight lasted.
The solid-rocket elements were based on, and utilized hardware from, the solid rocket boosters that help lift space shuttles into orbit.
After liftoff, the rocket's two stages separated as planned about two minutes into the flight when an explosive device along their boundary fired on schedule. The first stage sank under parachutes to be collected by boats from the sea so that its onboard data could be retrieved. The dummy second stage was left to sink into the Atlantic Ocean.
Despite the apparent success of Ares I-X's flight, the ultimate future of the Ares I rocket is uncertain.
The booster was originally designed to replace the space shuttles as a vehicle to ferry crews to the International Space Station. But the station is set to be de-orbited around 2016 and Ares I is not likely to be ready before 2017, defeating much of its purpose, some experts have said.
Last week, an independent review team appointed by U.S. President Barack Obama released a report detailing the status of America's human spaceflight program, and outlined possible alternate visions for NASA's future.
The president is currently reviewing the report and is expected to make a decision soon about whether to proceed with the Constellation program, which includes Ares I, or take the agency in a new direction. The report suggested that President Obama consider giving up on Ares I and instead urging private industry to step in and design a low-earth orbit vehicle for humans. That way, NASA could focus on building a heavy-lift vehicle to take people to the moon and Mars.
Despite the doubts hanging over the program, and the perhaps unfortunate timing of the panel's report being released less than a week before the Ares I-X launch, mission managers say they are focusing on the task at hand.
"The timing is what it is, but the test is significant and it's one that we fully back," said Doug Cooke, associate administrator of NASA's exploration systems.
Mission managers said that even if NASA does not go forward with Ares I, Tuesday's flight test provided useful data, not just about that particular rocket, but about the process of designing and building new rockets in general.
"The data were going to get and the objectives we're going to get are really germane to a whole class of launch vehicles," Ess said.
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SPACE.com is providing full coverage of NASA's Ares I-X test flight with Staff Writer Clara Moskowitz in Cape Canaveral, Fla., and Managing Editor Tariq Malik in New York. Click here for mission updates.