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Astronomy · L5 · Formation of a Schwarzschild Black Hole

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From core collapse of a massive star to a stable Schwarzschild spacetime with event horizon, photon sphere, and ISCO.

by @openstemUpdated Astronomy
Massive stellar core(> ~3 M☉ remnant)fusion no longer supports itUnchecked gravitational collapse— no degeneracy pressure sufficesEvent horizon formsr_s = 2GM/c²Photon sphere establishedr_ph = 1.5 r_s — unstable light orbitsISCO establishedr_ISCO = 3 r_s — inner edge of any diskBlack hole shadow observable(Event Horizon Telescope)Accreting matter radiates X-raysdown to the ISCO, then plungesCurvature singularity at r = 0GR description breaks down

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