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The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. It was formed 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.
A Cosmic History of the Solar System; A Tediously Accurate Map of the Solar System (web based scroll map scaled to the Moon being 1 pixel) NASA/JPL Solar System main page. NASA's Solar System Simulator; Solar System Profile by NASA's Solar System Exploration
Historical models of the Solar System. Approximate sizes of the planets relative to each other. Outward from the Sun, the planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Jupiter's diameter is about 11 times that of the Earth's and the Sun's diameter is about 10 times Jupiter's.
Solar System models, especially mechanical models, called orreries, that illustrate the relative positions and motions of the planets and moons in the Solar System have been built for centuries. While they often showed relative sizes, these models were usually not built to scale.
Pre-telescope[edit] See also: Planet § History, History of astronomy, Timeline of Solar System astronomy, and Historical models of the Solar System. Map of Anaximander 's universe (circa 560 BCE) The first humans had limited understanding of the celestial bodies that could be seen in the sky.
The Sun in true white color (from Solar System) The Solar System within the interstellar medium, with the different regions and their distances on a steped horizontal distance scale (from Solar System) To-scale diagram of distance between planets, with the white bar showing orbital variations.
Contents. Formation and evolution of the Solar System. There is evidence that the formation of the Solar System began about 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. [1] Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary ...
Solar System: 1.23 pc 3.80×10 13: 13.58: The Sun and its planetary system. Cited diameter is that of the Sun's Hill sphere; the region of its gravitational influence. Local Interstellar Cloud: 9.2 pc 2.84×10 14: 14.45: Interstellar cloud of gas through which the Sun and a number of other stars are currently travelling. Local Bubble: 2.82–250 pc
Historical models of the Solar System; History of astronomy; Timeline of cosmological theories; The number of currently known, or observed, objects of the Solar System are in the hundreds of thousands. Many of them are listed in the following articles: List of Solar System objects; List of gravitationally rounded objects of the Solar System
The following is a list of Solar System objects by orbit, ordered by increasing distance from the Sun. Most named objects in this list have a diameter of 500 km or more. The Sun, a spectral class G2V main-sequence star. The inner Solar System and the terrestrial planets.
