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post #1 of 3 (permalink) Old 02-12-2009, 04:07 AM Thread Starter
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US and Russian satellites collide

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US and Russian satellites collide
The US satellite was operated by the Iridium communications network [Photo credit: Iridium]

A privately-owned US telecommunications satellite has collided with a defunct Russian satellite in what US military officials say is the first such orbital collision ever recorded.

The crash occurred on Tuesday at an altitude of about 780km, destroying both satellites and creating a cloud of debris that officials say could threaten other satellites including the International Space Station.

The satellites hit each other at a combined velocity of about 11km-a-second, or 10 times faster than a rifle bullet.

The US satellite was operated by Iridium, a satellite telephone provider, which operates a global network of 66 communication satellites.

The Maryland-based company said the collision was not a result of any error on its part and said it would be deploying a spare satellite already in orbit to replace the one destroyed.

The collision took place in an area of space known as low-earth orbit which is used by hundreds of communications and weather-monitoring satellites.

Serious problem

Air Force Colonel Les Kodlick of the US military's Strategic Command, which monitors thousands of pieces of space debris, said the a debris cloud created by the collision was being tracked to see what kind of threat it may pose.

Space debris

US Space Command is tracking more than 18,000 objects, including 900 operational satellites, in orbit at altitudes between 100km and 32,000km above Earth.

Thousands more objects smaller than about 10cm across are too small to track by radar, but still pose a danger.

The oldest piece of space debris is a sphere about 15cm in diameter launched in 1958.

Nasa regularly has to alter the flight path on shuttle missions to avoid potentially dangerous debris.
"We believe it's the first time that two satellites have collided in orbit," he told the Reuters news agency, adding that the area where the collision took place was "very important for a lot of satellites".

He said the Command's Joint Space Operations Centre was tracking 500 to 600 new bits of debris, some as small as 10cm across.

Nasa, the US space agency, said it was assessing the risk posed to the international space station and its crew of three, but said it believed any danger was "very small".

The space station flies about 500km below the orbit where the collision took place.

The growing amount of space debris is becoming an increasingly serious problem for satellite operators and countries sending humans into orbit.

Travelling at high velocities in space, even tiny pieces of debris such as flecks of paint or a loose bolt have the potential to seriously damage or destroy other spacecraft.

The US Strategic Command says it is tracking more than 18,000 potentially dangerous objects and regularly has to move US defence satellites out of the way of potential harm.

The debris, which can stay in orbit for tens or even hundreds of years, includes larger pieces such as defunct satellites and spent rocket boosters, as well as thousands of smaller pieces such as tools dropped by astronauts.

China was widely criticised by other space-faring nations in 2007 after it destroyed one of its own obsolete weather satellites using a ground-launched ballistic missile.

The apparent test of a Chinese anti-satellite weapon generated a cloud of about 2,500 pieces of debris.

An unnamed US government spokesman told Reuters there was no indication that Tuesday's collision was the result of deliberate action.
Source: Agencies
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post #2 of 3 (permalink) Old 02-12-2009, 04:37 AM
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post #3 of 3 (permalink) Old 02-12-2009, 05:31 AM
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If you believe this was by accident, call me ,I have one hell of a deal on a condo in Florida for you.
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