[VadeRetro]

Says Krolik, "If a black hole is born spinning extremely rapidly, its 'drive train' can be so powerful that its capture of additional mass causes its rotation to slow down. Accretion of mass would then act as a 'governor,' enforcing a cosmic speed limit on black hole spins."

This reminds me of the "Stump the Dummies" question about how the solar system could have formed with so much of its angular momentum concentrated in the outer planets and so little in the Sun. The answer is that the Sun slowed its rotation while pushing magnetically on the magnetic fields of the planets, transferring its momentum to them.

[js1138]

This reminds me of the "Stump the Dummies" question about how the solar system could have formed with so much of its angular momentum concentrated in the outer planets and so little in the Sun. The answer is that the Sun slowed its rotation while pushing magnetically on the magnetic fields of the planets, transferring its momentum to them.

Or why the moon is falling away from the earth.