Planetary (*) rings form at a distance named for this scientist beyond which an object's attraction to itself can't hold it together.
If two objects have equal density, a distance named for this scientist can be calculated to be equal to the square root of 16 times the radius of the larger object. The point at which two roughly teardrop shaped regions named for this scientist touch each other is the inner Lagrangian point. Planetary (*) rings form at a distance named for this scientist beyond which an object's attraction to itself can't hold it together. Some "lobes" in binary systems are named after - for 10 points - what scientist, who names a limit beyond which tidal forces break up orbiting objects?
If two objects have equal density, a distance named for this scientist can be calculated to be equal to the square root of 16 times the radius of the larger object.
Édouard Albert Roche