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Why don't Saturn's rings unite to form a moon?

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The material of Saturn's rings can't form moons because the rings are too close to Saturn. ... The ring material is not able to gravitationally come together to form much larger objects against the tidal forces. ... The rings are not continuous - there are gaps - and this is said to be due to the effect of the shepherd moons. read more

The material of Saturn's rings can't form moons because the rings are too close to Saturn. They are all within a distance called the "Roche Limit." This is a distance that varies from planet to planet on the basis of the mass of the planet. read more

Saturn has a shed-load of moons, some bigger than our moon, many larger than the largest asteroid; these all orbit in more or less the plane of the rings, and in fact some share almost the same orbit (shepherd moons) and swap positions each time they get close enough to interact gravitationally. read more

This has since been called "The Roche Limit". This is due to tidal forces being so large that they ovewhelm accretion forces. The rings of Saturn are inside this Roche limit, so they cannot form into moons even if they wanted to. read more

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why don t all planets have one moon like the earth how do ...
Source: ucolick.org

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