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The boundary in the Solar System beyond which those volatile substances could coalesce is known as the frost line, and it lies at roughly five times the Earth's distance from the Sun.

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It is thought to be remnants from the Solar System's formation that failed to coalesce because of the gravitational interference of Jupiter. When discovered in 1930, it was considered to be the ninth planet; this changed in 2006 with the adoption of a formal definition of planet.

Uranus, having occasionally been observed since antiquity, was recognized to be a planet orbiting beyond Saturn by 1783. The Oort cloud, which is thought to be the source for long-period comets, may also exist at a distance roughly a thousand times further than the heliosphere. Many of the largest natural satellites are in synchronous rotation, with one face permanently turned toward their parent. To a good first approximation, Kepler's laws of planetary motion describe the orbits of objects around the Sun. Moreover, bombardment of the surface by solar wind particles, especially energetic ions, contributes to ejection of neutral species from the surface into the exosphere (via "sputtering") as well as other chemical and physical surface modification processes.

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The ring–moon systems of Jupiter, Saturn, and Uranus are like miniature versions of the Solar System; that of Neptune is significantly different, having been disrupted by the capture of its largest moon Triton. Attempts have been made to determine a relationship between these orbital distances, like the Titius–Bode law [57] and Johannes Kepler's model based on the Platonic solids, [58] but ongoing discoveries have invalidated these hypotheses. Mars has two tiny natural satellites ( Deimos and Phobos) thought to be either captured asteroids, [110] or ejected debris from a massive impact early in Mars's history. The zone of habitability of the Solar System is conventionally located in the inner Solar System, where planetary surface or atmospheric temperatures admit the possibility of liquid water.This stream of particles spreads outwards at speeds from 900,000 kilometres per hour (560,000mph) to 2,880,000 kilometres per hour (1,790,000mph), [64] filling the vacuum between the bodies of the Solar System. The dominant geological features are impact craters or basins with ejecta blankets, the remains of early volcanic activity including magma flows, and lobed ridges or rupes that were probably produced by a period of contraction early in the planet's history. By this definition, the Solar System has eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

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mySolar: Build Your Planets is a great game that allows you to effectively play god – you can build different planets and shape the universe as you see fit! The ices that formed these planets were more plentiful than the metals and silicates that formed the terrestrial inner planets, allowing them to grow massive enough to capture large atmospheres of hydrogen and helium, the lightest and most abundant elements. If you are interested in getting your own little astronaut ‘My Very Own Solar System’, then head over to Find Me a Gift, where you find this amongst other unique, imaginative gift ideas for children and adults alike. The Oort cloud is a hypothetical spherical cloud of up to a trillion icy objects that is thought to be the source for all long-period comets and to surround the Solar System at roughly 50,000AU (around 1 light-year (ly)) from the Sun, and possibly to as far as 100,000AU (1. average from the Sun), although smaller than Pluto, is the largest known object in the classical Kuiper belt (that is, a Kuiper belt object not in a confirmed resonance with Neptune).Beyond the orbit of Neptune lies the area of the " trans-Neptunian region", with the doughnut-shaped Kuiper belt, home of Pluto and several other dwarf planets, and an overlapping disc of scattered objects, which is tilted toward the plane of the Solar System and reaches much further out than the Kuiper belt. This region is also within the frost line, which is a little less than 5AU (750millionkm; 460millionmi) from the Sun. With the exception of Mercury, the orbits of the planets are nearly circular, but many comets, asteroids, and Kuiper belt objects follow highly elliptical orbits. The planet has no magnetic field that would prevent the depletion of its substantial atmosphere, which suggests that its atmosphere is being replenished by volcanic eruptions.

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We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Some astronomers consider the scattered disc to be merely another region of the Kuiper belt and describe scattered-disc objects as "scattered Kuiper belt objects". As a result of the formation of the Solar System, planets and most other objects orbit the Sun in the same direction that the Sun is rotating. The largest stable structure within the heliosphere is the heliospheric current sheet, a spiral form created by the actions of the Sun's rotating magnetic field on the interplanetary medium.Neptune was identified as a planet some years later, in 1846, thanks to its gravitational pull causing a slight but detectable variation in the orbit of Uranus.