Cassini Latest 2019 NASA Releases Stunning View of Earth All The Way From Saturn Science News
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Earth Astronomical symbol of WorldThe 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 the Sun and the only astronomical item known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over 4. 5 billion years ago. Earth's gravity treats other objects in space, especially the Sun and the Moon, Earth's only natural satellite television. Earth revolves around sunlight in 365. 26 times, a period known as an Earth year. Throughout this time, Earth revolves about its axis about 366. 26 times.
Earth'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 ocean tides, stabilizes Earth's alignment on its axis, and gradually slows its turn. Earth is the densest planet in the Photo voltaic System and the most significant of the four terrestrial planets.
Earth's lithosphere is divided into several firm 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, mostly by oceans. The remaining 29% is land consisting of continents and islands that collectively have many lakes, streams and other sources of water that contribute to the hydrosphere. Nearly all Earth's polar regions are covered 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 internal core, a liquid exterior core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.
Inside the first billion years of Earth's history, life appeared in the oceans and commenced to affect 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 dollars years ago. Since then, the mixture of Earth's distance from the Sun, physical properties, and geological history have allowed life to evolve and prosper. In the history of the Earth, biodiversity has eliminated 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 types in the world today vary broadly; most species have not been described. Over 7. 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 states.
The current English word Planet developed from a broad variety of Middle British forms, which derived from an Old English noun most often spelled eorðe. It has cognates in each Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In their earliest appearances, eorðe was already being used to convert the many senses of Latin terra and Ancient greek language γῆ (gē): the earth, their soil, dry land, a persons 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 because the mother of Thor.
Originally, planet was written in lowercase, and from early Center English, its definite sense as "the globe" was expressed as the earth. By Early Modern English, many nouns were capitalized, and the earth became (and often remained) the Earth, particularly if referenced along with other heavenly body. More recently, the name is sometimes simply given as Earth, by example with the names of the other planets. House styles now vary: Oxford spelling acknowledges the lowercase form as the most common, with the capitalized form an acceptable variant. Another convention capitalizes "Earth" when appearing as a name (e. g. "Earth's atmosphere") but writes it in lowercase when preceded by the (e. gary the gadget guy. "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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Space in Images 2015 04 Earth seen by Meteosat
