Outline of Earth

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The following outline is provided as an overview of and topical guide to the planet Earth:

Earth – third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to harbor life.

Classification of Earth[edit]

Location of Earth[edit]

Earth's location in the Universe

  • Universe – all of time and space and its contents.
    • Observable universe – spherical region of the Universe comprising all matter that may be observed from Earth at the present time, because light and other signals from these objects have had time to reach Earth since the beginning of the cosmological expansion.
      • Laniakea Supercluster – galaxy supercluster that is home to the Milky Way and approximately 100,000 other nearby galaxies. Includes the prior defined local supercluster, the Virgo Supercluster, as an appendage.

Movement of the Earth[edit]

Features of Earth[edit]

Earth's spheres[edit]

Atmosphere of Earth[edit]

Earth's biosphere[edit]

Earth's geosphere[edit]

Earth's hydrosphere[edit]

This sphere represents all water on Earth, wherever it is and in whatever form within the water cycle.

  • Water, by relative altitude
Atmospheric water[edit]
Cryosphere (frozen water)[edit]
Surface water[edit]
Water, by salt content[edit]

Astronomical events on Earth[edit]

Natural satellites of Earth[edit]

History of Earth[edit]

History of Earth

Future of Earth[edit]

Future of Earth

See also[edit]


  1. ^ "Sun: Facts & Figures". Solar System Exploration. National Aeronautics and Space Administration. Retrieved July 29, 2015.

External links[edit]