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    Earth

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    • Artificial satellites orbiting Earth

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    • Atmosphere of Earth

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    • Circumnavigators of the globe

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    • Earth deities

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    • Earth in fiction

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    • Flat Earth theory

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    • Geological history of Earth

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    • Hemispheres of the Earth

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    • Modern Earth impact events

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    • Near-Earth objects

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    • Oceans

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    • Earth orbits

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    • Earth phenomena

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    • Earth sciences

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    • Structure of the Earth

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    • Terrestrial biomes

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    • World

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    • Images of Earth

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    • Earth

    • Earth Astronomical symbol of Earth

      Earth, otherwise known as the world, (Greek: Γαῖα Gaia; Latin: Terra) is the third planet from the Sun and the only object in the Universe known to harbor life. It is the densest planet in the Solar System and the largest of the four terrestrial planets. According to radiometric dating and other sourc ... Read »


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    • Outline of 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. This sphere represents all water on Earth, wherever it is and in whatever form within the water cycle. ... Read »


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    • Anywhere on Earth

    • Anywhere on Earth (AoE) is a calendar designation which indicates that a period expires when the date passes everywhere on Earth. The last place on Earth where any date exists is on Howland Island, in the IDLW time zone (the "Hawaii side" of the International Date Line), and so is the last spot on the globe for any day ... Read »


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    • Asteroid impact avoidance

    • Asteroid impact avoidance comprises a number of methods by which near-Earth objects (NEO) could be diverted, preventing destructive impact events. A sufficiently large impact by an asteroid or other NEOs would cause, depending on its impact location, massive tsunamis, multiple firestorms and an impact winter caused by ... Read »


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    • Day length fluctuations

    • The length of the day, which has increased over the long term of Earth's history due to tidal effects, is also subject to change on a shorter scale of time. Exact measurements of time by atomic clocks and satellite laser ranging have revealed that the length of day (LOD) is subject to a number of different fluctuations ... Read »


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    • Demographics of the world

    • Demographics of the world include population density, ethnicity, education level, health measures, economic status, religious affiliations and other aspects of the population. The overall total population of the world is approximately 7.45 billion, to July 2016. Its overall population density is 50 people per km² ... Read »


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    • Earth in culture

    • The cultural perspective on the Earth, or world, varies by society and time period. Religious beliefs often include a creation belief as well as personification in the form of a deity. The exploration of the world has modified many of the perceptions of the planet, resulting in a viewpoint of a globally integrated ecos ... Read »


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    • Earth religion

    • Earth religion is a term used mostly in the context of neopaganism. Earth-centered religion or nature worship is a system of religion based on the veneration of natural phenomena. It covers any religion that worships the earth, nature, or fertility gods and goddesses, such as the various forms of goddess worship or ma ... Read »


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    • Earth's energy budget


    • Earth's internal heat budget


    • Geothermal energy

    • Geothermal energy is heat energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter. The geothermal energy of the Earth's crust originates from the original formation of the planet and from radioactive decay of materials (in currently uncertain but possibly roughly ... Read »


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    • Earth in science fiction

    • An overwhelming majority of fiction is set on or features the Earth. However, authors of speculative fiction novels and writers and directors of science fiction film deal with Earth quite differently from authors of conventional fiction. Unbound from the same ties that bind authors of traditional fiction to the Earth, ... Read »


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    • Figure of the Earth

    • The expression figure of the Earth has various meanings in geodesy according to the way it is used and the precision with which the Earth's size and shape is to be defined. While the sphere is a close approximation of the true figure of the Earth and satisfactory for many purposes, geodesists have developed a number of ... Read »


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    • Flag of Earth

    • A flag of Earth is a flag used to represent Earth. Although no flag has received any "official recognition" by any governmental body, some individuals and organizations have promoted designs for a flag. The most widely recognized flags associated with Earth are the flag of the United Nations and the Earth Day flag. Lis ... Read »


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    • Future of Earth

    • The biological and geological future of Earth can be extrapolated based upon the estimated effects of several long-term influences. These include the chemistry at Earth's surface, the rate of cooling of the planet's interior, the gravitational interactions with other objects in the Solar System, and a steady increase i ... Read »


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    • Gaia hypothesis

    • The Gaia hypothesis (/ˈɡaɪ.ə, ˈɡeɪ.ə/, GY-uh, GAY-uh), also known as the Gaia theory or the Gaia principle, proposes that organisms interact with their inorganic surroundings on Earth to form a synergistic self-regulating, complex system that helps to maintain and perpetuate the conditions for l ... Read »


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    • Geographical distance

    • Geographical distance is the distance measured along the surface of the earth. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic problem. Calculating ... Read »


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    • Geological history of Earth

    • The geological history of Earth follows the major events in Earth's past based on the geologic time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas ... Read »


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    • Geomagnetic reversal

    • A geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged, while geographic north and geographic south remain the same. The Earth's field has alternated between periods of normal polarity, in which the direction of the field was the sam ... Read »


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    • Geophysiology

    • Geophysiology (Geo, earth + physiology, the study of living bodies) is the study of interaction among living organisms on the Earth operating under the hypothesis that the Earth itself acts as a single living organism. The term "geophysiology" was popularized by James Lovelock in his writings on the Gaia hypothesis. T ... Read »


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    • Gravity of Earth

    • The gravity of Earth, which is denoted by g, refers to the acceleration that Is imparted to objects due to the distribution of mass within the Earth. In SI units this acceleration is measured in metres per second squared (in symbols, m/s2 or m·s−2) or equivalently in newtons per kilogram (N/kg or N·kg−1 ... Read »


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    • History of Earth

    • The history of Earth concerns the development of the planet Earth from its formation to the present day. Nearly all branches of natural science have contributed to the understanding of the main events of the Earth's past. The age of Earth is approximately one-third of the age of the universe. An immense amount of geolo ... Read »


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    • Jaramillo reversal

    • The Jaramillo reversal was a reversal and excursion of the Earth's magnetic field that occurred approximately one million years ago. In the geological time scale it was a "short-term" positive reversal in the then-dominant Matuyama reversed magnetic chronozone; its beginning is widely dated to 990,000 years before the ... Read »


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    • List of artificial radiation belts

    • Artificial radiation belts are radiation belts that have been created by high altitude nuclear explosions. The table above only lists those high-altitude nuclear explosions for which a reference exists in the open (unclassified) English-language scientific literature to persistent artificial radiation belts resulting ... Read »


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    • List of Earth flybys

    • List of Earth flybys is a list of cases where spacecraft incidentally performed Earth flybys, typically for a gravity assist to another body. ... Read »


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    • Earth's location in the Universe


    • Magmatic water

    • Magmatic water or juvenile water is water that exists within, and in equilibrium with, a magma or water-rich volatile fluids that are derived from a magma. This magmatic water is released to the atmosphere during a volcanic eruption. Magmatic water may also be released as hydrothermal fluids during the late stages of m ... Read »


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    • Earth mass

    • Earth mass (M⊕, where ⊕ is the standard astronomical symbol for planet Earth) is the unit of mass equal to that of Earth. This value includes the atmosphere but excludes the moon. The current best estimate for Earth mass is M⊕ = 7024597220000000000♠(5.9722±0.0006)×1024 kg Earth mass is a st ... Read »


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    • Mediocrity principle

    • The mediocrity principle is the philosophical notion that "if an item is drawn at random from one of several sets or categories, it's likelier to come from the most numerous category than from any one of the less numerous categories". The principle has been taken to suggest that there is nothing very unusual about the ... Read »


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    • Earth's orbit


    • Origin of water on Earth

    • The origin of water on Earth, or the reason that there is clearly more liquid water on Earth than on the other rocky planets of the Solar System, is not completely understood. There exist numerous more or less mutually compatible hypotheses as to how water may have accumulated on Earth's surface over the past 4.5 billi ... Read »


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    • Circle of Poison

    • The Circle of Poison (COP) refers to the export of domestically banned pesticides for use on foods elsewhere, some of which returns by way of import. The "circle" is complete when the toxic chemicals that were exported are then used to grow fruit, meat, and produce that are imported and available for domestic consumpti ... Read »


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    • Planetarium (board game)

    • Planetarium is a strategy board game designed by Stéphane Vachon. The theme of the game is planetary formation and the birth of a new solar system. In 2015, the game won the Le Plateau d'or, a game design contest presented during Les journées Ludique de Québec, an annual gaming convention held in Canada. In J ... Read »


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    • Precession

    • Precession is a change in the orientation of the rotational axis of a rotating body. In an appropriate reference frame it can be defined as a change in the first Euler angle, whereas the third Euler angle defines the rotation itself. In other words, if the axis of rotation of a body is itself rotating about a second ax ... Read »


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    • Earth radius

    • Earth radius is the distance from the Earth's center to its surface, about 6,371 km (3,959 mi). This length is also used as a unit of distance, especially in astronomy and geology, where it is usually denoted by R⊕. This article deals primarily with spherical and ellipsoidal models of the Earth. See Figure ... Read »


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    • Rare Earth hypothesis

    • In planetary astronomy and astrobiology, the Rare Earth Hypothesis argues that the origin of life and the evolution of biological complexity such as sexually reproducing, multicellular organisms on Earth (and, subsequently, human intelligence) required an improbable combination of astrophysical and geological events an ... Read »


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    • Earth orientation parameters

    • Earth orientation parameters (EOP) are a collection of parameters that describe irregularities in the rotation of the Earth. The Earth's rotation is not even. Any motion in/on the Earth causes a slowdown or speedup of the rotation, or a change of rotation axis. Most of them can be ignored, but movements of very large ... Read »


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    • Earth's rotation


    • Earth's shadow


    • Spherical Earth

    • The earliest reliably documented mention of the spherical Earth concept dates from around the 6th century BC when it appeared in ancient Greek philosophy but remained a matter of speculation until the 3rd century BC, when Hellenistic astronomy established the spherical shape of the Earth as a physical given. The ... Read »


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    • Subsolar point

    • The subsolar point on a planet is where its sun is perceived to be directly overhead (in zenith); that is where the sun's rays are hitting the planet exactly perpendicular to its surface. It can also mean the point closest to the sun on an object in space, even though the sun might not be visible. For planets with an ... Read »


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    • Substorm

    • A substorm, sometimes referred to as a magnetospheric substorm or an auroral substorm, is a brief disturbance in the Earth's magnetosphere that causes energy to be released from the "tail" of the magnetosphere and injected into the high latitude ionosphere. Visually, a substorm is seen as a sudden brightening and incre ... Read »


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    • Near-Earth supernova

    • A near-Earth supernova is an explosion resulting from the death of a star that occurs close enough to the Earth (roughly less than 10 to 300 parsecs (30 to 1000 light-years) away) to have noticeable effects on its biosphere. On average, a supernova explosion occurs within 10 parsecs (33 light-years) of the Eart ... Read »


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    • Earth symbol

    • A variety of symbols or iconographic conventions are used to represent , either in the sense of planet Earth, or the inhabited world. Representations of the globe of Earth, either with an indication of the shape of the continents or with a representation of meridians and parallels remains a common pictographic conventi ... Read »


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    • Transit of Earth from Mars

    • A transit of Earth across the Sun as seen from Mars takes place when the planet Earth passes directly between the Sun and Mars, obscuring a small part of the Sun's disc for an observer on Mars. During a transit, Earth would be visible from Mars as a small black disc moving across the face of the Sun. They occur every 2 ... Read »


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    • Windows on Earth

    • Windows on Earth is a museum exhibit, Web site, and exploration tool, developed by TERC, Inc. (Technical Education Research Centers, an educational non-profit organization), and the Association of Space Explorers, that enables the public to explore an interactive, virtual view of Earth from space. In addition, the tool ... Read »


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    • World

    • The world is the planet Earth and all life upon it, including human civilization. In a philosophical context, the world is the whole of the physical Universe, or an ontological world. In a theological context, the world is the material or the profane sphere, as opposed to the celestial, spiritual, transcendent or sacre ... Read »


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