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Encyclopedia > Inner solar system

An inner planet is any one of the Solar system's rocky planets that lie inside the asteroid belt: Mercury (planet), Venus (planet), Earth (planet) and Mars (planet). The remaining planets are deemed the outer planets. Presentation of the solar system (not to scale) The solar system comprises our Sun and the retinue of celestial objects gravitationally bound to it. ... Image of the main asteroid belt between the orbits of Mars and Jupiter. ... Atmospheric characteristics Atmospheric pressure trace Potassium 31. ... (*min temperature refers to cloud tops only) Atmospheric characteristics Atmospheric pressure 9. ... Earth, also known as the Earth or Terra, is the third planet outward from the Sun. ... Mars is the fourth planet from the Sun in the solar system, named after the Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. ... The outer planets are those planets that have been discovered in the modern era. ...


This classification should not be confused with the term inferior planet which designates those planets which lie inside the Earth's orbit (thus Mercury and Venus only). The terms inferior planet and superior planet were coined by Copernicus to distinguish a planets orbits size in relation to the Earths. ...


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Solar system - Wikipedia, the free encyclopedia (5172 words)
"the Alpha Centauri system" or "the 51 Pegasi system").
In the outer regions of this solar nebula, ice and volatile gases were able to survive, and as a result, the inner planets are rocky and the outer planets were massive enough to capture large amounts of lighter gases, such as hydrogen and helium.
The point at which the solar system ends and interstellar space begins is not precisely defined, since its outer boundaries are delineated by two separate forces: the solar wind and the Sun's gravity.
MSN Encarta - Solar System (1824 words)
Solar System, the Sun and everything that orbits the Sun, including the nine planets and their satellites; the asteroids and comets; and interplanetary dust and gas.
The dimensions of the solar system are specified in terms of the mean distance from Earth to the Sun, called the astronomical unit (AU).
The solar system was the only planetary system known to exist around a star similar to the Sun until 1995, when astronomers discovered a planet about 0.6 times the mass of Jupiter orbiting the star 51 Pegasi.
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