Outline of Earth

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

Location of Earth

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.
        • Virgo Supercluster one of the approximately 10 million superclusters in the observable universe. It spans 33 megaparsecs (110 million light-years), and contains at least 100 galaxy groups and clusters, including the Local Group.

Movement of the Earth

Features of Earth

Earth's spheres

Atmosphere of Earth

Earth's biosphere

Earth's geosphere

Earth's hydrosphere

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

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

Astronomical events on Earth

Natural satellites of Earth

History of Earth

History of Earth

Future of Earth

Future of Earth

See also


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