If double stars have one black hole and one ordinary star, black hole can pull gas from star, making a disk {accretion disk}. Gas has fast-moving charged particles, whose magnetic interactions cause turbulence (magnetorotational instability). Gas particles closer to black hole are faster. Magnetic attractions slow near-black-hole gas particles, so they move closer to black hole. Magnetic attractions speed far particles, so they move farther from black hole. Overall potential energy decreases, and kinetic energy increases (generating heat), providing energy for accretion disk to radiate.
Physical Sciences>Astronomy>Universe>Cosmology>Singularity>Black Hole
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Date Modified: 2022.0224