asteroid - a large, irregularly-shaped rocky object, made of mostly iron and nickel, that orbits the Sun, gravity - the force that attracts a body or mass towards the center of the Earth or towards any other physical body having mass. , planet - a celestial, spherical body moving in an elliptical orbit around a star., star - a self-luminous, celestial body made of a mass of extremely hot gas held together by its own gravity. , terrestrial planet - the planets closest to the Sun that are made of rock and metal, and have a solid outer layer. , comet - a celestial body made of mostly gas, dust, and ice that moves around the Sun in an elliptical orbit, revolution - the time it takes for a celestial body to complete its orbit around another object, rotation - the time it takes for a celestial body to spin once around its axis, meteor - the name for a meteoroid that has entered the Earth's atmosphere causing a streak of light from the heat of friction, orbit - the elliptical path of a celestial object or spacecraft around a star, planet, or moon, gas giant - the large planets furthest from the Sun which are composed mostly of gases, such as hydrogen and helium, with relatively small rocky core. , meteoroid - a small, rocky object that moves through space and orbit the sun, meteorite - the name for a meteoroid that has struck a planet or moon, usually leaving an impact crater. ,

The Solar System

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