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Tchekhovskoy, Magnetohydrodynamic simulations of active galactic nucleus disks and jets, Annual Review of Astronomy and Astrophysics, 2020","review_link":"https://arxiv.org/abs/2101.08839","review_verified":"true","summary":"Gas spiraling into black holes and neutron stars must shed angular momentum (rotation) to fall in; on the way it switches between distinct states, flickers with near-regular rhythms, and part of the released energy is shot out as jets near light speed. 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