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New research indicates that Earth's core, located nearly 3,000 kilometers beneath the surface, may contain significant amounts of hydrogen, enough to form up to 45 oceans. While the core is primarily composed of iron and nickel, experiments simulating extreme conditions suggest that hydrogen could be dissolved in molten metal.

This discovery sheds light on Earth's formation 4.5 billion years ago, indicating that hydrogen may have been trapped during the planet's accretion from water-rich materials in the early solar system. The core's hydrogen content implies complex exchanges between Earth's layers and could alter our understanding of the origin of surface water.