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S26E84: Milestone Orbits // Martian Meltwater // Earth's Water Origins and More

SpaceTime: Your Guide to Space & Astronomy

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The Origins of Earth's Dry Materials

Chemical signatures from deep within the planet show a lack of so-called volatiles. This suggests that the early Earth was primarily composed of dry rocky materials. A major addition of life essential volatiles, including water, only occurred during the last 15% or less of Earth's formation.

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