Stunning NASA image of Earth from 40MILLION miles away shows how ALONE we are 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 sunlight and the only astronomical thing known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over 4. 5 billion years ago. Earth's gravity interacts with other items in space, especially the Sun and the Moon, Earth's only natural satellite. Earth revolves around the sunlight in 365. 26 days, 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 marine tides, stabilizes Earth's positioning on its axis, and gradually slows its turn. Earth is the densest planet in the Solar System and the greatest of the four terrestrial planets.
Earth's lithosphere is divided into several firm tectonic plates that migrate 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 rest of the 29% is land comprising regions and islands that with each other have many lakes, rivers and other sources of water that contribute to the hydrosphere. Virtually all Earth's polar regions are protected 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 just the first billion years of Earth's history, life appeared in the seas and began to affect 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 dollars years ago. Since then, the combo of Earth's distance from the Sun, physical properties, and geological history have allowed life to evolve and thrive. In the great the Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. More than 99% of all species that ever lived on Earth are extinct. Estimates of the number of varieties in the world today vary extensively; most species have not been described. Over seven. 6 billion humans live on Earth and depend upon its biosphere and natural resources for their success.[40] Humans allow us diverse societies and cultures; politically, the world has about 200 sovereign states.
The modern English word Earth developed from a wide variety of Middle English forms, which derived from a classic English noun most often spelled eorðe. That has cognates in most Germanic language, and their proto-Germanic root has been reconstructed as *erþō. In its earliest appearances, eorðe was already being used to translate the many senses of Latin terra and Ancient greek language γῆ (gē): the ground, the soil, dry land, your 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 mom of Thor.
Originally, world was written in lowercase, and from early Middle 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 alongside 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 most common, with the made a fortune 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 in the world are you doing? ".
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