Why Magnetic Fields Make Black Holes Quiet express
At the centers of many galaxies lurk supermassive black holes, surrounded by disks of gas, cosmic dust, and stars. Their collisions can spawn gravitational waves — ripples in spacetime. The old picture, developed by Rashid Sunyaev, portrayed this disk as thin and flat, like a packed dance floor: any movement causes a bump.
New research confirms: thickness rules the fate of collisions. Thin disk — cramped, thick disk — empty. Magnetic fields threading the disk can inflate it to enormous sizes, especially in the outer regions. Then, instead of a bustling cosmic mosh pit, near-absolute silence falls.
If the disk stayed flat like a packed dance floor, collisions would thunder nonstop. But magnetic fields transform it into an empty multi-story atrium, where encounters are almost impossible.