The only way this could be explained was if the inner core was spinning slightly faster than the rest of the planet.
BBC: NEWS | Science/Nature | Earth's core runs ahead of crust
This means that in 900 years, the inner core would gain one full rotation on the rest of the planet.
Just as seismic waves moving through Earth provide information about our planet's insides, so sound waves travelling through a star carry information about its inner workings.
BBC: Team records 'music' from stars
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