a solar system, a star and the natural objects that move around it, a planet, a very big round object that travels around a star, a moon, a natural object which travels around a planet, an asteroid, a big piece of rock that travels around a star, a comet, a small frozen ball which sometimes has a bright tail, to orbit, to travel around a star or a planet, gas, not a solid or a liquid, a space mission, a journey into space, to do a special job.

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