Earlier outer space was the stuff of science fiction novels-today, about 800 artificial satellites are orbiting in space. These are specially designed flying machines, which encircle the Earth or the moon in fixed orbits. Numerous scientific probes were sent into space by various countries, and, since its establishment, the ISS has continued to enrich our knowledge of the endless universe and to open up possibilities of putting it to use. But our increasing activities in space have given rise to a new and serious problem: the accumulation of space debris.
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