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Archive - Feb 15, 2009

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Man-made junk in low Earth orbit: satellite collision highlights space pollution and rising hazard from debris

more than 6000 satellites have been launched; half of all trackable objects are due to in-orbit explosions (200) or collisions (less than 10)

(quote)

The military tracks about 18,000 pieces of orbital debris. On Tuesday, the census of space-garbage suddenly jumped by 600, the initial estimate of the number of fragments from a stunning collision of two satellites high above Siberia.

Space is now polluted with the flotsam of a satellite-dependent civilization. The debris is increasingly a hazard for astronauts and has put crafts such as the Hubble Space Telescope and communications satellites at risk of being struck by an object moving at high speed.

the satellite collision involved an Iridium commercial satellite, which was launched in 1997, and a Russian satellite launched in 1993

The military's radar can spot objects about four inches in diameter - roughly the size of a baseball - or larger. This collision, however, may have produced many thousands of small, undetectable pieces of debris that would still carry enough kinetic punch at orbital velocities to damage or destroy a spacecraft. read more »

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