Crash of US, Russian Satellites a Threat in Space

This image provided by NASA shows an artist concept of an Iridium satellite in earth orbit. Two big...

This image provided by NASA shows an artist concept of an Iridium satellite in earth orbit. Two big communications satellites collided in the first-ever crash of its kind in orbit over Siberia Tuesday Feb. 10, 2009, shooting out a pair of massive debris clouds and posing a slight risk to the international space station. The collision involved an Iridium commercial satellite, which was launched in 1997, and a Russian satellite launched in 1993 and believed to be nonfunctioning. (AP Photo/NASA)

(AP)

U.S. and Russian officials traded shots Thursday over who was to blame for a huge satellite collision this week that spewed speeding clouds of debris into space, threatening other unmanned spacecraft in nearby orbits.

The smashup 500 miles (800 kilometers) over Siberia on Tuesday involved a derelict Russian spacecraft designed for military communications and a working satellite owned by U.S.-based Iridium, which served commercial customers as well as the U.S. Department of Defense.

A prominent Russian space expert suggested NASA fell down on the job by not warning of the collision. But U.S. space experts said the Russian has the wrong agency.

The U.S. military tracks the 18,000 objects in orbit, monitoring only certain threats because it lacks the resources to do everything, said Maj. Regina Winchester, spokeswoman for U.S. Strategic Command, which oversees the military's Space Surveillance Network.

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Iridium spokeswoman Elizabeth Mailander said the company can move any of its 65 satellites out of the way if it gets a precise warning ahead of a crash. Such a warning was not made Tuesday, Mailander said.

But the company has never redirected a satellite before because the warnings they get aren't precise enough and there are just too many satellites to be constantly rejiggering their orbit, she said.

"Ours was where it was supposed to be and it was functioning," Mailander said. She said Iridium hasn't talked with Russian space officials.

No one has any idea yet how many pieces of space junk were generated by the collision or how big they might be. But the crash scattered space junk in orbits 300 to 800 miles (500 to 1,300 kilometers) above Earth, according to Maj.-Gen. Alexander Yakushin, chief of staff for the Russian military's Space Forces.

Experts in space debris will meet next week in Vienna at a U.N. seminar to come up with better ways to prevent future crashes, said NASA orbital debris program manager Nicholas Johnson.