The Earth has more angular momentum than any Earth-mass black hole could have! m_E≈6×10^24 kg r_E≈6.4×10^6 m ω_E≈72.7×10^{-6} s^{-1} J_E ≈ (2/5) m_E r_E^2 ω ≈ 7.1×10^{33} if uniform density, but realistically J_E > 3×10^{32} The Kerr limit is J = (G/c) M_E ≈ 7.9×10^{30}
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One reference claims the Sun also exceeds its Kerr limit, but that’s based on a calculation that assumes a uniform density and rate of rotation. The accepted value of the Sun’s angular momentum is: J_S = 1.92×10^{41} [https://arxiv.org/abs/1112.4168 ] which is 20% of the Kerr limit.
21:41 - 1. velj 2020.
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