| Noun | 1. | solar system - the sun with the celestial bodies that revolve around it in its gravitational fieldsystem, scheme - a group of independent but interrelated elements comprising a unified whole; "a vast system of production and distribution and consumption keep the country going" heliosphere - the region inside the heliopause containing the sun and solar system earth, globe, world - the 3rd planet from the sun; the planet we live on; "the Earth moves around the sun"; "he sailed around the world" interplanetary medium - interplanetary space including forms of energy and gas and dust Jupiter - the largest planet and the 5th from the sun; has many satellites and is one of the brightest objects in the night sky Edgeworth-Kuiper belt, Kuiper belt - a disk-shaped region of minor planets outside the orbit of Neptune Mars, Red Planet - a small reddish planet that is the 4th from the sun and is periodically visible to the naked eye; minerals rich in iron cover its surface and are responsible for its characteristic color; "Mars has two satellites" Mercury - the smallest planet and the nearest to the sun minor planet, planetoid - any of numerous small celestial bodies that move around the sun Neptune - a giant planet with a ring of ice particles; the 8th planet from the sun is the most remote of the gas giants; "the existence of Neptune was predicted from perturbations in the orbit of Uranus and it was then identified in 1846" outer planet - (astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto) major planet, planet - (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction Pluto - a small planet and the farthest known planet from the sun; it has the most elliptical orbit of all the planets; "Pluto was discovered by Clyde Tombaugh in 1930" Saturn - a giant planet that is surrounded by three planar concentric rings of ice particles; the 6th planet from the sun Sun - the star that is the source of light and heat for the planets in the solar system; "the sun contains 99.85% of the mass in the solar system"; "the Earth revolves around the Sun" Uranus - a giant planet with a ring of ice particles; the 7th planet from the sun has a blue-green color and many satellites; "Uranus was discovered by William Herschel in 1781" Venus - the second nearest planet to the sun; it is peculiar in that its rotation is slow and retrograde (in the opposite sense of the Earth and all other planets except Uranus); it is visible from Earth as an early `morning star' or an `evening star'; "before it was known that they were the same object the evening star was called Venus and the morning star was called Lucifer" |