Laplace"s hypothesis had the great advantage of starting with

an extended mass already in rotation, but it violated fatally
the law of constancy of moment of momentum
Laplace"s hypothesis had the great advantage of starting with
an extended mass already in rotation, but it violated fatally
the law of constancy of moment of momentum. We should expect
this hypothesis to create a solar system free from
irregularities, very much as if it were the product of an
instrument-maker"s precision lathe. The solar system as it
exists is a combination of regularities and many surprising
irregularities.