Assertion: terrestrial planet's structure | /r/CapableOf | observe in iron meteorites
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text: The structures observed in iron meteorites are easily visible to the eye, and require cooling over very long periods of time, probably in excess of a million years; and the only way we can imagine this happening is if a fairly large body (hundreds of miles in diameter) melted, allowing heavy stuff to sink to the middle and light stuff to float to the top, then cooled and solidified.