While the odds are tiny that anyone on Earth will be hit, the chances that all this orbiting sapce debris and litter will interfere with working satellites or the International Space Station are getting higher, according to a recent report by the National Research Council.

The nonprofit group, which dispenses advice on scientific matters, concluded that the problem of extraterrestrial clutter had reached a point where, if nothing was done, a cascade of collisions would eventually make low-Earth orbit unusable.

“NASA is taking it very seriously,” said Mason A. Peck, chief technologist for the National Aeronautics and Space Administration.

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