Earth

Earth is the third planet from the Sun in the Solar System, characterized by a nitrogen‑oxygen atmosphere, abundant liquid water on its surface, and a diverse biosphere that supports a wide range of life forms. It has a radius of about 6,371 km, a mass of roughly 5.97 × 10²⁴ kg, and completes one rotation on its axis approximately every 24 hours, giving rise to the cycle of day and night. Its gravitational interaction with the Moon produces ocean tides and stabilizes the planet’s axial tilt, influencing seasonal climate patterns.

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