The core fear is that any conflict in space would cause the most injury to America since America has the most to lose. Damaged planes crash to the ground and destroyed ships sink to the bottom of the sea. But the weightlessness of space means that debris keeps spinning around the Earth for years, if not centuries. Each destruction of a satellite creates, in effect, thousands of missiles zipping round randomly; each subsequent impact provides yet more high-speed debris. At some point, given enough litter, there would be a chain reaction of impacts that would render parts of low-Earth orbit—the location of about half the active satellites—unusable.

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