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26. X-rays that come from the vicinity of a black hole actually originate from. well inside the event horizon. its exact center, or singularity. relatively far away from the black hole, where matter is still relatively cool.just outside the event horizon, on the accretion disk.. The black hole modifies spacetime around it so much that particles and X-rays are created in the vacuum itself, just outside the event horizon. The X-rays are produced by vibrations of the black hole itself, and therefore they come from the event horizon, and not from inside the black hole.
Since observations indicate the universe is almost flat, we expect the total energy density of everything in the universe to sum to 1 (Î©tot ~ 1). The measured dark energy density is ÏÎ» = ~0.690; the observed ordinary matter energy density is Î©m = ~0.0482 and the energy density of radiation is negligible. This leaves a missing Î©dm = ~0.258 that nonetheless behaves like matter (see technical definition section above) â dark matter.