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Renee Roberts asked the Naked Scientists:Hello, Naked Scientists!Could you tell me how non-rotating black holes form? What happens to the spin impulse of the material falling into them? Thanks for a great podcast! Naked Science rocks! ;-)What do you think?

The Schwarzschild Blackhole is an exact solution of Einstein's equations, so it is not neglecting anything. Same thing canbe said about the Kerr and other Kerr-Newman solutions.

One way in which a non-rotating blackhole could form is by slowing down the rotation of an already rotating blackhole. The so-called "penrose process" is capable of extracting rotational energy from a rotating blackhole. But in general I guess we would expect physically realistic blackholes to be rotating.

One should never mistake the solution of an equation for a real physical object.

The Schwarzschild Blackhole is an exact solution of Einstein's equations, so it is not neglecting anything.

Same thing canbe said about the Kerr and other Kerr-Newman solutions.One way in which a non-rotating blackhole could form is by slowing down the rotation of an already rotating blackhole. The so-called "penrose process" is capable of extracting rotational energy from a rotating blackhole. But in general I guess we would expect physically realistic blackholes to be rotating. One should never mistake the solution of an equation for a real physical object.

The process obeys the laws of black hole mechanics. A consequence of these laws is that if the process is performed repeatedly, the black hole can eventually lose all of its angular momentum, becoming rotationally stationary.