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).
Movement of the Earth Earth's orbit Earth's rotation Earth's precession
Features of Earth Age of the Earth Figure of the Earth (size and shape) Earth radius Models of the Earth Globe World map Gravity of Earth Earth's magnetic field Natural environment
Earth's spheres
Atmosphere of Earth
Earth's biosphere Ecosystems Biomes biogeographic realms Marine realms Bioregions Ecoregions (list) Anthroposphere Noosphere
Earth's geosphere Structure of the Earth Earth's surface Lithosphere of Earth (solid Earth) Earth's crust Land Landforms (list) Continents Africa Antarctica Asia Australia Europe North America South America Pedosphere Ocean floor Earth's mantle Earth's core Outer core Inner core
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 Water vapor Clouds Precipitation
Cryosphere (frozen water) Polar ice caps Ice sheets Ice caps Glaciers
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 Fresh water Brackish water Seawater
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 History of Earth
Age of the Earth Geocentric model Geological history of Earth Geologic time scale Early Earth Timeline of natural history Human history
Future of Earth Future of Earth
Climate change Global catastrophic risk
See also
References
External links
National Geographic encyclopedic entry about Earth Earth – Profile – Solar System Exploration – NASA Earth – Climate Changes Cause Shape to Change Archived 2022-11-15 at the Wayback Machine – 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)