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General characteristics. Astronomers sometimes divide the Solar System structure into separate regions. The inner Solar System includes Mercury, Venus, Earth, Mars, and the bodies in the asteroid belt. The outer Solar System includes Jupiter, Saturn, Uranus, Neptune, and the bodies in the Kuiper belt. [32]
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
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 .
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.
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.
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
List of natural satellites. Of the Solar System 's eight planets and its nine most likely dwarf planets, six planets and seven dwarf planets are known to be orbited by at least 300 natural satellites, or moons. At least 19 of them are large enough to be gravitationally rounded; of these, all are covered by a crust of ice except for Earth's Moon ...
This article includes a list of the most massive known objects of the Solar System and partial lists of smaller objects by observed mean radius. These lists can be sorted according to an object's radius and mass and, for the most massive objects, volume, density, and surface gravity, if these values are available.
Map showing the Sun located near the edge of the Local Interstellar Cloud and Alpha Centauri about 4 light-years away in the neighboring G-Cloud complex. The Local Interstellar Cloud (LIC), also known as the Local Fluff, is an interstellar cloud roughly 30 light-years (9.2 pc) across, through which the Solar System is moving.
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.
