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To: Snowshoe who wrote (71126)2/12/2009 1:50:10 PM
From: Maurice Winn1 Recommendation  Read Replies (4) | Respond to of 74559
 
To collide, they had to be going in different directions, which means the debris is going slower than it was. They were going at the same speed, since they were in orbit, therefore nearly all debris is going slower and some will be going a LOT slower meaning it'll fall to ground.

If they were traveling in opposite directions, a lot would fall to ground. But they were probably going almost at right angles because Iridium is a polar orbit and the Russian one was probably more equatorial. So it would have been a big crash, rather than just a bump as would happen with two geostationary satellites getting too close and bumping.

The stuff that falls down will nearly all melt, burn, splatter and shatter in the atmosphere into small bits.

Mqurice