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The orbits of Solar System planets are nearly circular. Compared to many other systems, they have smaller orbital eccentricity. [70] Although there are attempts to explain it partly with a bias in the radial-velocity detection method and partly with long interactions of a quite high number of planets, the exact causes remain undetermined. [70] [74]
{{Infobox planetary system | title = Solar System | image = Planets2013.jpg | image_scale = 1.5 | image_alt = A representative image of the Solar System with sizes but not distances to scale | caption = {{longitem | The [[Sun]] and [[List of gravitationally rounded objects of the Solar System # Planets | planets of the Solar System]].
The Solar System belts were formed in the formation and evolution of the Solar System. [6] [7] The Grand tack hypothesis is a model of the unique placement of the giant planets and the Solar System belts. [3] [4] [8] Most giant planets found outside our Solar System, exoplanets, are inside the snow line, and are called Hot Jupiters.
Jupiter was the first of the Sun's planets to form, and its inward migration during the primordial phase of the Solar System affected much of the formation history of the other planets. Jupiter's atmosphere consists of 76% hydrogen and 24% helium by mass, with a denser interior.
{{Infobox planetary system | title = Solar System | image = Planets2013.jpg | image_scale = 1.5 | image_alt = A representative image of the Solar System with sizes but not distances to scale | caption = {{longitem | The [[Sun]] and [[List of gravitationally rounded objects of the Solar System # Planets | planets of the Solar System]].
A small orrery showing Earth and the inner planets. An orrery is a mechanical model of the Solar System that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; however, since accurate scaling is often not ...
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Venus to scale among the Inner Solar System planetary-mass objects, arranged by the order of their orbits outward from the Sun (from left: Mercury, Venus, Earth, the Moon, Mars and Ceres) Venus is one of the four terrestrial planets in the Solar System, meaning that it is a rocky body like