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Frame-dragging makes the entire disk wobble in circles, similar to how a gyroscope precesses.

Through a process known as frame-dragging, the black hole causes the disk’s axis of rotation to swing round, or “precess.”

At the same time, this magnetic field causes the spin of the muons to precess smoothly like a gyroscope, as the particles travel around the ring, but with a small wobble.

A vertical magnetic field bends their trajectories around the ring and also makes their spin axis twirl, or precess, like a wobbling gyroscope.

These beams precess like a gyroscope, periodically entering Earth’s field of view.