A possible explanation for Uranus’s odd tilt angle and opposite spin

A small team of researchers has developed a theory to explain the odd tilt of Uranus and its opposite spin. They suggest the unique tilt angle is due to the migration of its moons. The group has published a paper describing their work on the preprint server arXiv and are awaiting results of peer review before it is published in the journal Astronomy & Astrophysics. They found that a moon with just half the mass of the one circling Earth could raise Uranus’ tilt angle to close to 90° over millions of years.

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