Space in Images 209 Earth seen by Wallspotz
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Earth images
World Astronomical symbol of PlanetThe particular Blue Marble, the first full-view photograph of the planet, was captured by astronauts en route to the Moon in 1972
Earth is the third planet from sunlight and the only astronomical object known to harbor life. According to radiometric dating and some other sources of evidence, Planet formed over 4. 5 billion years ago. Globe's gravity treats other objects in space, especially the Sun and the Celestial body overhead, Earth's only natural satellite tv. Earth revolves around the Sun in 365. 26 days, a period known as an Earth year. During this time, Earth moves about its axis about 366. 26 times.
Earth's axis of rotation is tilted with respect to its orbital plane, producing seasons in the world. The gravitational interaction between Earth and the Moon causes marine tides, stabilizes Earth's orientation on its axis, and steadily slows its turn. Earth is the densest planet in the Sun System and the most significant of the four terrestrial planets.
Earth's lithosphere is divided into several firm tectonic plates that migrate across the surface over periods of many thousands of years. About 71% of Earth's surface is covered with water, generally by oceans. The 29% is land comprising areas and islands that collectively have many lakes, streams and other sources of water that contribute to the hydrosphere. The majority of Globe's polar regions are included in ice, such as the Antarctic ice sheet and the sea ice of the Arctic ice pack. Globe's interior remains active with a solid iron interior core, a liquid exterior core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.
Within the first billion years of Earth's history, life appeared in the seas and started out to influence the Earth's atmosphere and surface, leading to the proliferation of aerobic and anaerobic organisms. Some geological evidence indicates that life may have arisen as much as 4. 1 billion years ago. Since then, the mixture of Earth's distance from the Sunshine, physical properties, and geological history have allowed life to evolve and prosper. In the good the Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. Over 99% of species that ever lived on World are extinct. Estimates of the number of species on the planet today vary widely; most species have not been described. Over several. 6 billion humans live on Earth and depend on its biosphere and natural resources for their success.[40] Humans are suffering from diverse societies and cultures; politically, the world has about 200 sovereign says.
The present day English word Planet developed from a large variety of Middle English forms, which derived from a classic English noun most often spelled eorðe. This has cognates in each Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In the earliest appearances, eorðe was already being used to translate the many senses of Latin terra and Greek γῆ (gē): the floor, the soil, dry land, the human world, the surface of the world (including the sea), and the world itself. As with Terra and Gaia, Earth was a personified goddess in Germanic paganism: the Angles were listed by Tacitus as among the devotees of Nerthus, and later Norse mythology included Jörð, a giantess often given as the mother of Thor.
Originally, earth was written in lowercase, and from early Middle English, its definite sense as "the globe" was expressed as the planet. By Early Modern The english language, many nouns were capitalized, and the earth became (and often remained) the Earth, particularly if referenced along with other heavenly bodies. More recently, the name is sometimes simply given as Earth, by analogy with the names of some other planets. House styles now vary: Oxford spelling recognizes the lowercase form as the most common, with the made a fortune form an acceptable alternative. Another convention capitalizes "Earth" when appearing as a name (e. g. "Earth's atmosphere") but writes it in lowercase when preceded by the (e. h. "the atmosphere of the earth"). It almost always appears in lowercase in colloquial expressions such as "what on earth are you doing? ".
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