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).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.More recently, the name is sometimes simply given as Earth, by analogy with the names of the other planets."Earth's atmosphere") but writes it in lowercase when preceded by the (e.g. It almost always appears in lowercase in colloquial expressions such as "what on earth are you doing? The formation and evolution of Solar System bodies occurred along with the Sun.
Within the first billion years of Earth's history, life appeared in the oceans and began to affect the Earth's atmosphere and surface, leading to the proliferation of aerobic and anaerobic organisms.It has cognates in every 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 Greek γῆ (gē): the ground, Originally, earth was written in lowercase, and from early Middle English, its definite sense as "the globe" was expressed as the earth.A nebula contains gas, ice grains, and dust (including primordial nuclides).According to nebular theory, planetesimals formed by accretion, with the primordial Earth taking 10– Earth's atmosphere and oceans were formed by volcanic activity and outgassing that included water vapor.On time scales lasting hundreds of millions of years, the supercontinents have assembled and broken apart.