Outline of Earth

Overview of and topical guide to 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

Astronomical object
- Gravitationally rounded object
  - Planet
    - Planet of the Solar System
      - Inner planet
    - Terrestrial planet

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.
      - Local Group – specific galaxy group that includes the Milky Way and at least 53 other galaxies, most of them dwarf galaxies.
        Milky Way Galaxy – a specific barred spiral galaxy
        Orion Arm – a spiral arm of the Milky Way
        Solar System – the Sun and the objects that orbit it, including eight planets, the third planet closest to the Sun being Earth
        Earth's orbit – path through which the Earth travels around the Sun. The average distance between the Earth and the Sun is 149.60 million kilometers (92.96 million miles).^[1]

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

Bodies of water (list)
World Ocean
Southern Ocean
Oceans - This includes the Earth's five oceans: The Arctic Ocean, the Atlantic Ocean, the Indian Ocean, and the Pacific Ocean.
Groundwater

Water, by salt content

Astronomical events on Earth

Meteor showers (list)
Meteorite falls
Tides
Eclipse - This includes both a lunar eclipse and solar eclipse.
Equinox - This includes both the March equinox and the September equinox.
Solstice - This includes the Summer solstice, June solstice, Winter solstice, and December solstice
- Stonehenge
- Manhattanhenge

Natural satellites of Earth

Moon

History of Earth

Future of Earth

References

^ "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

Earth at Wikipedia's sister projects

Definitions from Wiktionary
Media from Commons
News from Wikinews
Quotations from Wikiquote
Texts from Wikisource
Textbooks from Wikibooks
Resources from Wikiversity

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)