The inner solar system rotates more slowly than it should

The inner solar system rotates much slower than modern laws of physics predict, and a new study may help explain why.

A thin disk of gas and dust – known as an accretion disk – orbits young stars. These disks, where planets form, contain the remnants of star-forming material that makes up a small fraction of the star’s mass. According to the law of conservation of angular momentum, the inner part of the disk should rotate faster as the spiral material slowly spins inward toward the star, similar to the way ice skaters spin faster when they bring their arms close to their bodies.

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