The impact of space debris

Some space rubble is natural micrometeoroids, like the fragment that struck the starboard payload bay radiator of the STS-115 flight in 2006.

Even tiny, untrackable micro-debris can become a problem. A paint fragment chipped off a spacecraft can move at nearly ten times the speed of a bullet and puncture an astronaut's suit, crack a window of a Space Station, and potentially destroy satellites.