Outline_of_Earth
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.
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]
- Solar System – the Sun and the objects that orbit it, including eight planets, the third planet closest to the Sun being Earth
- Orion Arm – a spiral arm of the Milky Way
- Milky Way Galaxy – a specific barred spiral galaxy
- Local Group – specific galaxy group that includes the Milky Way and at least 53 other galaxies, most of them dwarf galaxies.
- 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.
- 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.
- 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.
- Age of the Earth
- Figure of the Earth (size and shape)
- Earth radius
- Models of the 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
Natural satellites of Earth
- "Sun: Facts & Figures". Solar System Exploration. National Aeronautics and Space Administration. Archived from the original on July 3, 2015. Retrieved July 29, 2015.
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)