Most, if not all, remaining life will be destroyed by the Sun's increased luminosity (peaking at about 5,000 times its present level).
The average diameter of the reference spheroid is 12,742 kilometres (7,918 mi).
House styles now vary: Oxford spelling recognizes 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.
Local topography deviates from this idealized spheroid, although on a global scale these deviations are small compared to Earth's radius: The maximum deviation of only 0.17% is at the Mariana Trench (10,911 metres (35,797 ft) below local sea level), whereas Mount Everest (8,848 metres (29,029 ft) above local sea level) represents a deviation of 0.14%.
In geodesy, the exact shape that Earth's oceans would adopt in the absence of land and perturbations such as tides and winds is called the geoid.
Some geological evidence indicates that life may have arisen as much as 4.1 billion years ago.
Roughly True multicellular organisms formed as cells within colonies became increasingly specialized.During this time, Earth rotates about its axis about 366.26 times.Earth is the densest planet in the Solar System and the largest of the four terrestrial planets.The origin of the world's oceans was condensation augmented by water and ice delivered by asteroids, protoplanets, and comets.Continents formed by plate tectonics, a process ultimately driven by the continuous loss of heat from Earth's interior.By Early Modern English, many nouns were capitalized, and the earth became (and often remained) the Earth, particularly when referenced along with other heavenly bodies.