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The author concludes that the risk of a collision between satellites is likely to increase in the future. This is because once a collision occurs, it will produce satellite fragments, and these fragments will lead to other collisions with satellites and produce more fragments. Eventually, the area around Earth will be cluttered with these satellite fragments. This is why the risk of a satellite colliding with another satellite or satellite fragment will go up in the future.
The referenced text is the conclusion of the argument.
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