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Things You Thought You Knew – Magnetic Cores & Flipping Poles
StarTalk Radio
The Magnetic Field and the Universe
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There's no requirement that the magnetic field exactly align with the geography. In fact, well, it makes sense that it wouldn't because like you said, the core is spinning inside of this kind of liquid. And so by the way, planets that have solid cores don't have magnetic fields. We think Mars is solid all the way through. It's got hardly any barely any magnetic field. But Earth we know has an active core.
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