Firstly, their calculations suggested that the wobbles could arise from a core that was squashed or elongated by 20-60km: a huge, central rugby ball of rock.
Alternatively, the moon could have a normal spherical core and crust, but separated by a "global ocean". That way, Dr Tajeddine explained, "the shell can wobble more easily, because it's not attached to another mass".
Of the two explanations, he favours the subterranean sea.
"When we saw this wobbling, the first thing we thought of was an ocean," Dr Tajeddine said.
Either possibility would make Mimas a much more interesting research subject: "This brings the spotlight back to this moon, which was a little bit ignored."
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