Earth

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Can you find the Earth in this picture?[1]

Earth is one of nine eight eleven (so far) n [2]planets (specifically, a rocky one due to its solid surface, as with the rest of the first four planets, though much of the the majority of the rock on our own planet is underwater). in the solar system orbiting a star, sometimes called Sol in random science fiction stories. While some believe there is intelligent life on Earth, others are too smart to really believe this.

Earth is also one of the four fundamental elements the Greeks philosophised about, the others being water, air and fire. Some people consider their philosophical ruminations to be somewhat naive. If you consider that they were doing said philosophizing a good few thousand years ago, and the four elements line up pretty well with solid, liquid, gas and energy, perhaps they were not too far off the mark after all.

Contents

[edit] Fun facts about the Earth

[edit] Fact sheet (serious)

  • Radius (volumetric mean) = 6371.0 km
    • Equatorial = 6378.1 km
    • Polar = 6356.8 km
    • Crust depth = 25 km (varies)
    • Mantle thickness = 2860 km
    • Core = 3480 km
  • Mass = 5.9736E24 kg
    • Atmosphere = 5.1E18 kg
    • Hydrosphere = 1.4E21 kg
    • Crust = 3.4E22 kg
    • Mantle = 4.0E24 kg
    • Core = 1.9E24 kg
  • Distance from the Sun = 1.4960E11 m
  • Distance from the Moon = 3.8440E8 m
  • Escape velocity = 11.186 km/s
  • Bond albedo = 0.306
  • Surface temperature = 288 K
  • Gravitational binding energy = 2.5E32 J
  • Moment of inertia = 8.02E37 kg m²
  • Density = 5514.8 kg/m³
    • Atmosphere (surface) = 1.217 kg/m³
    • Crust = 2700 kg/m³
    • Mantle = 4500 kg/m³
    • Core = 1.1E4 kg/m³

[edit] See also

[edit] Footnotes

  1. Voyager 1, 1990
  2. fuck the IAU and its fascist definition of what a planet is!
  3. For the sake of gratuitous pedantry, the names are in the Latin language, and borrowed into English.
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