It is the region around a celestial body within which no other body can be found without being disintegrated by the powerful tidal forces, due to the gravitational effect of the main body.
If the density of the main body and the secondary body are approximately equal, the Roche limit is around 2.44 radii of the main body. This means that if the secondary body approaches the inside of this limit, it is destroyed. Therefore, when the density of the secondary body is lower than that of the main body, the Roche limit is higher.
All satellites in the solar system are obviously outside the Roche boundary. The fact that Saturn's rings are within this limit offers an explanation of the fact that the materials with which they are constituted have not been able to meet to form a satellite.
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