450-mile-wide solid metal ball forms Earth's innermost core, earthquake waves reveal

Scientists calculated the diameter of Earth

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Solid metal ball discovered within Earth's inner core •

More evidence found showing the moon's inner core is solid, like Earth's : r/space

450-mile-wide solid metal ball forms Earth's innermost core

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What is the temperature of the Earth's core? How deep down is it from the Earth's surface? - Quora

Scientists Discover Gigantic Solid Metal Ball Inside the Earth's Core

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Earth's innermost layer is a 400-mile-wide ball of iron, new study suggests, News

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