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Approaching a Black Hole

Things with no place

How does this exist in spatial relation to other knowledge?

This arrangement is schematic. Distance and direction on this diagram carry no physical meaning — it shows how these things relate, not where they are. Nothing here is measured position, live telemetry or a simulation.

BodiesIdeas and conditionsBlack hole entropyInnermost stable circular orbitThe Kerr solution and black hole spinThe no-hair resultThe photon sphere and the shadowSchwarzschild radiusThe singularityEvent Horizon TelescopeCygnus X-1The event horizonM87* - the supermassive black hole in Messier 87S2 - the star that measured the Galactic centreSagittarius A* - the black hole at the centre of the Milky WayJacob BekensteinKarl SchwarzschildRoger PenroseStephen HawkingAccretion discTime dilation near a horizonGravitational wavesHawking radiationRelativistic jetTidal stretching near a black holeThe black hole information paradoxSouth Pole TelescopeVery long baseline interferometry
Schematic. 26 objects, arranged by kind. No position, no distance, no motion.
Bodies4

A whole world, moon or star — the thing a site is on.

Ideas and conditions22

Something with no place at all: a condition, a plan, an idea.