The Science of The Callisto Incident

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An "R-Jay" is how the characters in the story refer to a Jupiter Radius, about 69,000 kilometers. Io orbits at roughly 6 R-Jays, Europa at 9.5 R-Jays, Ganymede at 15 R-Jays, and Callisto at 26.5 R-Jays.


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