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the_geth t1_jdwx7pi wrote

Reply to comment by DDWingert in Around 550 million years ago the earth's magnetic field almost collapsed, but then strengthened a few million years later. Scientists say this may have been due to the formation of the inner core. But why exactly would that cause the magnetic field to get stronger? by somethingX

>They cannot directly measure the magnetic field due to the location and extreme temperatures of materials in the core

... WHAT
We can absolutely measure Earth Magnetic field (and many more, distant or not). I do not understand this sentence, what am I missing?

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