Innermost Stable Circular Orbit ·
ISCO
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.com · r = 6GM/c² · marginal stability · the plunge
Orbit r
— GM/c²
Radial ω
—
phase
—
Event horizon · 2GM/c²
Photon sphere · 3GM/c²
ISCO · 6GM/c²
Stable orbit / test mass
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.com · Innermost Stable Circular Orbit: The Edge Beyond Which Orbits Plunge