Low Earth Orbit objects are moving very, very fast, but they're quite tiny - relatively - given the enormous size of their orbits, so two satellites running into each other is highly unlikely. While highly improbable, it isn't impossible, as this week proved: An Iridium sattelite-phone relay collided with a non-operational Russian satellite earlier this week at around 15,000 mph (over Mach 20 at sealevel), creating two belts of debris that will continually circle the earth until other objects cross their orbit (possibly causing damage that creates more shrapnel debris) or they fall into the atmosphere.
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