Scientists have long wondered what lies at the very center of the Earth, and the latest research is putting weight behind a theory that our planet has a distinct ball of iron within its metallic core
Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. . Beneath the outermost crust, the mantle and the molten-liquid outer core lies the Earth’s solid metal center — which actually has a hidden layer, or an “innermost inner core” within, according to a new study.
Detection through quake activity The reason this layer had not been previously observed in more detail is because its composition is so similar to what lies above it, Pham said. Both this newly detected center — which the study reports is likely a 400-mile-wide ball of metal — and its outer shell are made of iron-nickel alloy, with trace amounts of other elements.
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