What does the Roche limit mean?
The Roche limit is the approximate closest distance where tidal forces can overcome a satellite's self-gravitational cohesion.
Formation, motion and physical explanation
The near side is pulled more strongly, stretching the satellite. A fluid body may break apart, while solid material strength adds resistance.
Evidence, applications and limits
Some rings lie inside the limit, inhibiting formation of a large moon. The value depends on density, structure and orbit, so no universal distance exists. Conclusions about distant objects rely on testing images, spectra, time variation and physical models together.
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