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Planet Astronomical symbol of PlanetThe Blue Marble, the first full-view photograph of the planet, was captured by astronauts en route to the Moon in 72
Earth is the third planet from the sunlight and the only astronomical thing known to harbor life. In accordance with radiometric dating and other sources of evidence, Earth formed over 4. 5 billion years ago. Globe's gravity interacts with other things in space, especially the Sun and the Moon, Earth's only natural satellite tv. Earth revolves around the sunlight in 365. 26 days and nights, a period known as an Earth year. In the course of 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 Earth. The gravitational interaction between Earth and the Moon causes ocean tides, stabilizes Earth's positioning on its axis, and steadily slows its turn. Earth is the densest planet in the Photo voltaic System and the largest of the four terrestrial planets.
Earth's lithosphere is divided into several rigid tectonic plates that move across the surface over periods of many millions of years. About 71% of Earth's surface is covered with water, mostly by oceans. The rest of the 29% is land including continents and islands that together have many lakes, rivers and other sources of water that contribute to the hydrosphere. The majority of Globe's polar regions are covered in ice, including 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 began 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 combination of Earth's distance from the Sunlight, 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. Above 99% of all species that ever lived on Earth are extinct. Estimates of the number of varieties on the planet today vary broadly; most species have not been described. Over several. 6 billion humans live on Earth and rely on its biosphere and natural resources for their survival.[40] Humans allow us diverse societies and ethnicities; politically, the world has about 200 sovereign states.
The present day English word Planet developed from a broad variety of Middle English forms, which derived from a vintage English noun most often spelled eorðe. That has cognates in each Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In their earliest appearances, eorðe was already used to convert the many senses of Latin terra and Ancient greek language 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 posted 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 when referenced together with other heavenly body. More recently, the name is sometimes simply given as Earth, by example with the names of some other planets. House styles now vary: Oxford spelling recognizes the lowercase form as the utmost 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 the planet are you doing? ".
Full Earth, Closeup Digital Art by Nasa Earth Observatory/spl
LOIRP Releases Recovered Lunar Orbiter V Image of u0026quot;Full Earthu0026quot; Moonviews
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