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An unmanned cargo rocket bound for the International Space Station exploded Tuesday over a launchpad in Virginia.
No injuries were reported following the first catastrophic launch in NASA's commercial spaceflight effort.
The accident at Orbital Sciences Corp.'s launch complex at Wallops Island was sure to draw criticism over the space agency's growing reliance on private U.S. companies in this post-shuttle effort.
NASA is paying billions of dollars to Orbital Sciences and the SpaceX company to make station deliveries, and it's counting on SpaceX and Boeing to start flying U.S. astronauts to the orbiting lab as early as 2017. NASA spokesman Rob Navias said there was nothing on the lost flight that was urgently needed by the six people living on the space station.
Orbital Sciences' Antares rocket blew up over the launch complex, just six seconds after the liftoff. The company said everyone at the site had been accounted for, and the damage appeared to be limited to the facilities.
Flames could be seen shooting into the sky as the sun set. There was no hint of any trouble until the rocket exploded. This was the second launch attempt for the mission. Monday evening's try was thwarted by a stray sailboat in the rocket's danger zone. The restrictions are in case of just such an accident that occurred Tuesday.
"We will understand what happened — hopefully soon — and we'll get things back on track," Orbital Sciences' executive vice president Frank Culbertson told his team an hour after the failure. "We've all seen this happen in our business before, and we've all seen the teams recover from this, and we will do the same."
The roomful of engineers and technicians were ordered to maintain all computer data for the ensuing investigation. Culbertson advised his staff not to talk to news reporters and to refrain from speculating among themselves.
"Definitely do not talk outside of our family," said Culbertson, a former astronaut who once served on the space station.
It was the fourth Cygnus bound for the orbiting lab; the first flew just over a year ago. SpaceX is scheduled to launch another Dragon supply ship from Cape Canaveral in December.
All the scientists and students behind the science experiments aboard the Cygnus were surely devastated. About one-third of the capsule's contents involved research. Among the instruments that were lost: a meteor tracker and 32 mini research satellites, along with numerous experiments compiled by schoolchildren.
The two Americans, three Russians and one German on the orbiting lab were informed promptly of the accident.
NASA spokesman Rob Navias said there was nothing urgently needed by the space station crew on that flight. In fact, the Russian Space Agency was proceeding with its own supply run on Wednesday.
Orbital has a $1.9 billion contract with NASA to deliver up to 44,000 pounds of cargo to the space station over eight missions through 2016 in the post-space shuttle era, according to Orbital's official website. This launch was Orbital's fourth mission to the space station, the company said.
In addition to the Antares rocket, a two-stage launch vehicle, Orbital's Cygnus spacecraft was carrying 5,050 pounds of supplies, which include science experiments, crew provisions, spare parts and experiment hardware. The mission marked the debut of Orbital's upgraded castor 30XL second-stage motor, which enables greater lift capacity, according to Orbital.
President Obama has long championed this commercial effort, urging that NASA focus its human spaceflight effort less on nearby orbit and more on destinations like asteroids and Mars. He was in Wisconsin for a campaign rally Tuesday evening and was kept abreast of the accident and its developments.
SpaceX's billionaire founder and chief officer Elon Musk — whose company is the face, in many ways, of the commercial effort — said he was sorry to learn about the failure. "Hope they recover soon," he said in a tweet.
Support poured in from elsewhere in the space community late Tuesday night.
"We are with you @OrbitalSciences and @NASA," former NASA astronaut Leland Melvin said via Twitter.
"Very sorry to see the Antares rocket launch failure," said Chris Hadfield, a former Canadian astronaut who served as space station commander last year. "Spaceflight is hard. Very glad that no one was hurt. Now time to sort out why & effects."
John Logdson, former space policy director at George Washington University, said it was unlikely to be a major setback to NASA's commercial space plans. But he noted it could derail Orbital Sciences for a while given the company has just one launch pad and the accident occurred right above it.
The explosion also hit Orbital Science's stock, which fell more than 15 percent in after-hours trading.
The Associated Press contributed to this report.
