Space Vacuums?
It's hard to know whether to be more concerned about the debris spewed into orbit by the collision of two satellites last week or by the fact that no one was able to predict the collision before it happened... The new debris adds to the growing amount of junk accumulating in orbit. Thus far the annoying objects have not had a major impact on human or robotic missions into space, but there are grave concerns for the future. At some cluttered altitudes, collisions are producing debris faster than gravity can eliminate it. If the trend is not reversed, one can imagine a time when it could be too risky or too expensive to fly spacecraft through the debris fields.
~ Fortune
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