Space in Images 2009 A Cloud free Image of The Earth
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Planet Astronomical symbol of PlanetTypically the Blue Marble, the first full-view photograph of the planet, was captured by astronauts en route to the Moon in 72
Earth is the 3rd planet from the Sun and the only astronomical thing known to harbor life. Based on radiometric dating and other sources of evidence, World formed over 4. 5 billion years ago. Globe's gravity treats other things in space, especially the Sun and the Moon, Earth's only natural satellite. Earth revolves around sunlight in 365. 26 days and nights, a period known as an Earth year. Throughout this time, Earth moves about its axis about 366. 26 times.
Globe's axis of rotation is tilted with respect to its orbital plane, producing seasons on the planet. The gravitational interaction between Earth and the Moon causes sea tides, stabilizes Earth's orientation on its axis, and slowly slows its turn. Earth is the densest planet in the Solar System and the most significant of the four terrestrial planets.
Earth's lithosphere is divided into several inflexible tectonic plates that move across the surface over periods of many hundreds of thousands of years. About 71% of Earth's surface is covered with water, generally by oceans. The rest of the 29% is land comprising regions and islands that collectively have many lakes, rivers and other sources of water that contribute to the hydrosphere. The majority of Earth's polar regions are protected in ice, like the Antarctic ice sheet and the sea ice of the Arctic ice pack. Earth's interior remains active with a solid iron interior core, a liquid external core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.
Within just the first billion years of Earth's history, life appeared in the seas and started to influence the Earth's atmosphere and surface, leading to the proliferation of aerobic and anaerobic organisms. Some geological evidence indicates that life might have arisen as much as 4. 1 billion years ago. Since then, the combo of Globe's distance from the Sun, physical properties, and geological history have allowed life to evolve and flourish. In the great the Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. Over 99% of all species that ever lived on World are extinct. Estimates of the number of varieties on Earth today vary extensively; most species have not been described. Over several. 6 billion humans live on Earth and depend upon its biosphere and natural resources for their success.[40] Humans allow us diverse societies and civilizations; politically, the world has about 200 sovereign declares.
The modern English word Planet developed from a broad variety of Middle English forms, which derived from a classic English noun most often spelled eorðe. It has cognates in most Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In the earliest appearances, eorðe was already used to convert the many senses of Latin terra and Greek γῆ (gē): the earth, their soil, dry land, the human world, the surface of the world (including the sea), and the globe 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 mommy of Thor.
Originally, earth was written in lowercase, and from early Midsection English, its definite sense as "the globe" was expressed as the earth. By Early Modern English, many nouns were made a fortune, and the earth became (and often remained) the Earth, particularly when referenced along with other heavenly body. More recently, the name is sometimes simply given as Earth, by analogy with the names of the other planets. House styles now vary: Oxford spelling identifies the lowercase form as the most common, with the capitalized form an acceptable version. Another convention capitalizes "Earth" when appearing as a name (e. g. "Earth's atmosphere") but writes it in lowercase when forwent by the (e. h. "the atmosphere of the earth"). It almost always appears in lowercase in colloquial expressions such as "what on the planet are you doing? ".
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