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Loading contentThe closest orbit around a black hole in which matter can circle stably — at three Schwarzschild radii for a non-spinning black hole, and closer for a rapidly spinning one. Inside it, matter spirals inevitably inward. The ISCO sets the inner edge of an accretion disk and thus how much energy accretion can release.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
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