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Earth is the third planet from the Sun and the only astronomical object known to harbor life.
With a vast amount of liquid water and an atmosphere that contains oxygen, Earth supports a diverse range of life forms.
Key Facts
- Orbital Period: 365.25 days
- Diameter: Approximately 12,742 km
- Climate: Supports a wide range of climates from arctic cold to desert heat
- Average Distance from the Sun: About 149.6 million km (1 AU)
- Orbital Speed: Approximately 29.78 km/s
Atmosphere
Earth's atmosphere is composed of 78% nitrogen and 21% oxygen, with traces of argon, carbon dioxide, and other gases. This unique composition supports and protects life.
Interesting Facts
- Earth's rotation is gradually slowing, which lengthens our days very slightly over long periods.
- The concept of Earth as the center of the universe was a long-held belief until proven otherwise by astronomers like Copernicus.
- 70% of Earth's surface is covered in water. Yet, humanity has explored less than 5% of the world's oceans, making them largely mysterious.
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