Humans first witnessed Earth as a complete orb floating in the inky blackness of space in December when Apollo 8 carried astronauts around the Moon. Robotic space probes on their way to destinations beyond Earth, such as the Galileo and the Near Earth Asteroid Rendezvous NEAR spacecraft in the s, also looked back with their cameras to provide other unique portraits of the planet. Viewed from another planet in the solar system, Earth would appear bright and bluish in colour. Easiest to see through a large telescope would be its atmospheric features, chiefly the swirling white cloud patterns of midlatitude and tropical stormsranged in roughly latitudinal belts around the planet.
By Early Modern Englishmany 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. 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.
It almost always appears in lowercase in colloquial expressions such as "what on earth are you doing? The bodies in the Solar System formed and evolved with the Sun.
In theory, a solar nebula partitions a volume out of a molecular cloud by gravitational collapse, which begins to spin and flatten into a circumstellar diskand then the planets grow out of that disk with the Sun. A nebula contains gas, ice grains, and dust including primordial nuclides.
Water vapor from these sources condensed into the oceans, augmented by water and ice from asteroids, protoplanetsand comets. The two models  that explain land mass propose either a steady growth to the present-day forms  or, more likely, a rapid growth  early in Earth history  followed by a long-term steady continental area.
Over the period of hundreds of millions of years, the supercontinents have assembled and broken apart.Brief fluctuations in Earth’s magnetic field have been detected before many earthquakes in the past 50 years, says Friedemann Freund, a crystallographer at San Jose State University in California.
Earth's magnetic field is a magnetic dipole, similar to that of a bar magnet tilted 11° from the earth's axis of rotation. The magnetic south pole is near the geographic south pole, and the magnetic north pole is near the geographic north pole.
The magnetic field at an average place on the Sun is around 1 Gauss, about twice as strong as the average field on the surface of Earth (around more Sunspots and Magnetic Fields Sunspots are caused by very strong magnetic fields on the Sun.
Earth’s magnetic field is far stronger than that of Venus or Mars, and this single fact explains why life on earth is abundant while its nearest neighboring planets do not at present support life.
Earth's magnetic field gets stretched out into a comet-like shape with a tail of magnetism that stretches millions of miles behind the earth, opposite from the sun. The sun has a wind of gas that pushes the earths field from the left to the right in the picture.
Due to this cyclic fluctuation, scientists have argued that the strength of the magnetic field cannot be used to determine an age for the earth, since it is a reversible, cyclic process (Stassin ).