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  • BBC Sky at Night

    CUTTING EDGE

    Jul 15, 2021 4 minutes

    Hunting oceans on Uranus’s moons

    The planet’s magnetic field could help to see beneath the icy surface of its moons

    While the Galileo probe was looping around the Jovian system in the 1990s it detected something very strange about two of the larger moons. Galileo was equipped with a magnetometer – an instrument for measuring magnetic fields, a bit like an extremely sensitive compass needle – and every time the spacecraft performed a flyby of Europa or Callisto it sensed the field lines of Jupiter’s powerful magnetic field draping around the moons. The satellites seemed to possess a weak magnetic field that was interacting with that of Jupiter.

    These tiny,

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