Well, they're just partly to blame. Next month the Space Shuttle Atlantis will be embarking on a mission to do repairs on the eighteen year-old Hubble Telescope. This mission might prove to be a bit tricky due to all the debris floating about in space. According to an article in the Christian Science Monitor:
"The environment where the Hubble orbits, about 350 miles above the Earth’s surface, has more debris than where the International Space Station orbits and where most shuttle missions are conducted, at about 210 miles above the Earth. This “space junk” includes defunct satellites and spent rocket stages, fragments from exploded satellites, rocket engine effluents, paint flakes, and other small particles – all traveling at speeds of more than 15,000 miles per hour."
That doesn't sound very good.
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