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The worst collision so far was deliberately caused by the Chinese military. Good job guys, way to show what a great country you are:

https://en.wikipedia.org/wiki/2007_Chinese_anti-satellite_mi...

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You should read the parts where it says US has done similar tests and that "In response to US weaponisation of space, the Chinese started a space defense program, including anti-satellite defense."

That being said, this is a great example related to the OP (e.g. number and sizes of tracked debris and for how long they remain dangerous).

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