A new computer model explains why the planet has a tilted orbit
A lingering problem with the giant impact explanation for Uranus’ angle is that the entire early solar system was a shooting gallery of whizzing planets and moons which should have knocked other planets similarly cockeyed. And yet, Uranus alone orbits sideways.
According to the new paper, it wasn’t an impact that tipped Uranus at all. Rather, it argues, a massive moon fell into orbit around the planet and gravitationally destabilized it. Using computer models, the researchers calculate that over time, the moon would have tilted Uranus to an angle of 80 degrees.
The theory is a sound one, at least as far as computer models can prove, and it could get a further test sometime after 2030. That’s when , which will make twin flybys first of Jupiter and then of Uranus, at last giving the sideways planet another up-close look.
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