Even though it’s no longer officially a planet, Pluto is still surprising astronomers.

Data from the Hubble Space Telescope shows that two of its moons, Nix and Hyrda, wobble so much, that they move unpredictably as they orbit, Al Jazeera reports.

That’s because they are buffeted by the strong gravitational pull of Pluto and its sister dwarf-planet Charon.

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