Pluto's moons wobble chaotically

NASA'S HUBBLE telescope has found that Pluto's moons, Nix and Hydra, wobble unpredictably. "If you lived on one of Pluto's moons, you might have a hard time determining when, or from which direction, the sun will rise each day," read a report published by NASA. The wobbling takes place because the moons are under the effect of a gravitational field that keeps shifting. This happens because of the double planet system of Pluto and Charon. "Called a double planet because of their common centre of gravity, which is located in the space between the two bodies, the changing gravitational field makes the moons tumble," says the report.

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