An object in motion will remain in motion unless acted on by some other force.
A torpedo sized space missile will only be slightly slowed by micro-meteor size particles.
Collision with obects more massive will absorbe some kinetic energy,and likely change both object's course.
Gravity effects would big the big vacuum cleaner for these kinds of space trash. Getting caught by a planetery or stellar gravity source would keep such items from wandering too far, and would cause the most significant deceleration effects.
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May've been the losing side. I'm still not convinved it was the wrong one.
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