↩ 🔵 🔵 🔵 ❪∂_❫ Relativistic Subs ○ ❪∂₌❫ Physical Formulations ○ Gravitational Radius (R𝘨≡GM∕c²) ○￩ ISCO Radius (R𝘪𝘴𝘤𝘰=6R𝘨) ○￩ Schwarzschild Radius (R𝘴=2R𝘨) ○￩ Spin (a=J∕cM) ○￩