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Loading contentThe growing population of defunct satellites, spent rocket stages, and fragments of past collisions and explosions that circle the Earth. Travelling at kilometres per second, even a small piece can destroy an operational spacecraft, and there are millions of untracked fragments.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.