The Earth's history, layered structure, water source, planet formation progress, and habitable-zone planet search in geography.
Earth's history: The Earth's formation likely began from material in a large cloud of dust and gas. Over time, smaller particles gathered to form planets like Earth.
Earth's layered structure and water source: Earth developed its layered structure with a metal core, silicate mantle, and crust from cooling planetesimals. Water on Earth likely came from the same sources as the atmosphere.
Hunt for habitable-zone planets: Scientists have made progress finding planets in habitable zones outside our solar system, raising questions about our solar system's formation model.
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