* Astronomy

Gas-giant chaos will remain a mystery for now
Something as trivial as a passing comet could have a huge effect on the future motion of a gas giant like Jupiter, but we cannot know for the time being, claims a physicist in the US. By performing computer simulations, Wayne Hayes from the University of California in Irvine has shown that a more accurate knowledge of the positions of Jupiter, Saturn, Uranus and Neptune is required before scientists can determine whether chaos exists in the planets' trajectories.

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