Uranus marches to the beat of its own weird little drum.
. This could have happened, they found, almost without having any effect on the planet's spin rate.
It's not unusual for moons to migrate. Our own Moon is currently moving away from Earth at a rate of about 4 centimeters per year. Bodies orbiting a mutual center of gravity exert a tidal force on each other that gradually causes their rotations to slow. In turn, this loosens gravity's grip so that the distance between the two bodies widens.
However, a larger moon with a size comparable to Ganymede was more likely, in the simulations, to produce the tilt and spin we see in Uranus today. However, the minimum mass – about half an Earth Moon – is about four times the combined mass of the current known Uranian moons.became destabilized, triggering a chaotic phase for the spin axis that ended when the moon ultimately collided with the planet, effectively"fossilizing" Uranus' axial tilt and spin..
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