🔭 Basic Facts
| Property | Value |
|---|---|
| Position from Sun | 3rd planet |
| Average Distance | ~149.6 million km (1 AU) |
| Diameter | 12,742 km |
| Mass | 5.97 × 10²⁴ kg |
| Surface Gravity | 9.81 m/s² |
| Orbital Period | 365.25 days |
| Rotation Period | 23 hours 56 minutes (sidereal) |
| Axial Tilt | 23.44° |
| Average Surface Temp | ~15 °C |
| Moons | 1 (The Moon) |
| Atmosphere | Nitrogen (78%), Oxygen (21%), others |
🌌 Orbit and Rotation
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Nearly circular orbit with eccentricity ~0.0167.
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Earth rotates once approximately every 24 hours, causing day and night.
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Axial tilt of 23.44° causes seasonal changes.
🌍 Surface and Geology
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Surface is about 71% water (oceans) and 29% land (continents and islands).
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Diverse terrain: mountains, plains, deserts, forests, glaciers.
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Tectonic plates constantly move, causing earthquakes, volcanism, and mountain building.
☁️ Atmosphere
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Composed primarily of nitrogen and oxygen.
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Supports life by providing breathable air, climate regulation, and protection from solar and cosmic radiation.
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Contains the ozone layer that blocks harmful ultraviolet rays.
🧲 Magnetic Field
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Generated by the dynamo effect in the liquid outer core.
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Protects Earth from solar wind and cosmic radiation.
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Causes phenomena like auroras near the poles.
🌑 Internal Structure
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Layers: crust (solid), mantle (semi-solid), outer core (liquid iron and nickel), inner core (solid iron and nickel).
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Heat from the core drives plate tectonics and volcanic activity.
🛰️ Exploration and Observation
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First human-made satellite: Sputnik 1 (launched by USSR in 1957).
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Numerous Earth-observing satellites monitor weather, climate, and environment.
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Human space missions have orbited Earth and visited the Moon.
🧠 Interesting Facts
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Only known planet to support life.
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The Moon stabilizes Earth’s tilt, moderating climate.
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Earth’s atmosphere and oceans evolved over billions of years.
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Plate tectonics recycle carbon, playing a key role in climate regulation.