solar system - group of objects that revolve around a star, sun - medium sized star in the Milky Way Galaxy, classified as a yellow dwarf star., heliocentric - model of the solar system in which Earth and the other planets revolve around the sun, astronomical - comparative unit used to measure our solar system equal to the distance of the Earth to the Sun, planet - massive object that revolves around a star with a spherical shape and a clear, predictable orbit, comet - collection of ice, dust and small rocky particles that has a long narrow orbit around the sun, asteroid - rocky objects revolving around the sun that are too small and numerous to be considered planets, terrestrial - name given to the four inner planets that are composed of rock and metal, gas giant - name given to the four outer planets that are very massive, but with low average densities and no clear solid surface, satellite - moon, planet or machine that orbits a planet or star, space probe - a machine that travels through space to collect data, dwarf planet - smaller spherical object such as Ceres or Pluto that orbits the sun,

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