
According to the , there are eight planets in the Solar System, which are (in increasing distance from the Sun): Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Jupiter is the largest, at 318 , whereas Mercury is the smallest, at 0.055 Earth masses. The planets of the Solar System can be divided into categories based on their. . These are lists of planets. A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk. There are eight planets within the ; planets outside of the solar system are a.

The Solar System is the system of the and the objects that it. It when a dense region of a collapsed, forming the Sun and a . The Sun is a typical star that maintains a by the of hydrogen into helium at its , releasing this energy from its outer . Astronomers

See how large the planets appear in the sky. For local times and where to look etc., try the night sky in your location. The planets' apparent size is measured in arcseconds ("). For comparison, the Sun and the Moon measure about 1800 arcseconds. . We measure the apparent brightness of celestial bodies in magnitude. The brighter a planet shines, the lower the magnitude value. Negative numbers indicate that the.