Earth

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  • Earth is the third planet from the sun and is the largest of the inner planets in the solar system in both diameter and mass. The only planet in the Universe on which life is known to exist, Earth is home to millions of species, including at least one sentient life form, Homo sapiens sapiens.

    At the center of the Earth is a solid iron core, surrounded by magnetic liquid and a thick layer of mantle.

  • Fast Facts

    1. Also Known As: Gaea, The World, The Big Blue Marble, Terra
    2. Age: 4.54 BYA (approximate) Geography: Earth Facts
    3. Mean Diameter: 7,926 MilesHypertextbook: Earth's Diameter
    4. Mean Circumference: 24,880.616 miles Geography: Earth Facts
    5. Surface Land Area: 92,547,025.4 square miles Geography: Earth Facts
    6. Surface Water Area: 224,394,021 square miles Geography: Earth Facts
    7. Mass: 6.59182164 21 tons Geography: Earth Facts
    8. Escape Velocity: 6.95065816 miles per second Geography: Earth Facts
      1. Nitrogen
      : 78.08% Geography: Earth Facts
      1. Oxygen
      : 20.95% Geography: Earth Facts
      1. Argon
      : 0.93% Geography: Earth Facts
      1. Carbon Dioxide
      : 0.038 Geography: Earth Facts
      1. Trace elements and compounds
    9. Mean Distance from the sun: 93 million miles Geography: Earth Facts
    10. Orbital Period: 365.256366 days Geography: Earth Facts
    11. Orbital Eccentricity: 0.016710219 Geography: Earth Facts
    12. Axial Inclination: 23.439281° Geography: Earth Facts
  • An Abundance of Liquid Water

    About 71% of Earth's surface is covered in liquid water, mostly in the form of oceans. These seas not only help drive the atmosphere, they lubricate the crust of the planet, enabling the motion of tectonic plates. The movement of the plates constantly recycles the mineral and biological material available on the planet and in turn, shapes climate and makes ecosystems possible.
  • Guardian Moon

    Earth has one natural satellite, the moon, also known as Luna. This large satellite is believed to have been created from accreted orbital ejecta from the collision with Earth of a small planetoid early in the history of the solar system. The moon's gravity has attracted asteroids, comets, and meteors to its surface than may have otherwise struck Earth.

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