The solar system, not to scale.

The inner solar system spins much more slowly than it should

The inner solar system spins much more slowly than the laws of modern physics predict, and a new study may help to explain why.

A thin disk of gas and dust — known as an accretion disk — spirals around young stars. These disks, where planets form, contain leftover star-forming material that is a fraction of the star’s mass. According to the law of conservation of angular momentum, the inner part of the disk should spin faster as the material spirals slowly inward toward the star, similar to how figure skaters spin faster when they bring their arms closer to their bodies.

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