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.

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. Archived from the original on July 3, 2015. Retrieved July 29, 2015.

External links

  • National Geographic encyclopedic entry about Earth
  • Earth – Profile – Solar System Exploration – NASA
  • Earth – Climate Changes Cause Shape to Change – NASA
  • United States Geological Survey – USGS
  • Earth – Astronaut Photography Gateway – NASA
  • Earth Observatory – NASA
  • Earth – Audio (29:28) – Cain/Gay – Astronomy Cast (2007)
  • Earth – Videos – International Space Station:
    • Video (01:02) – Earth (time-lapse)
    • Video (00:27) – Earth and Auroras (time-lapse)