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moon the earth's natural satellite. It revolves around the earth from west to east in about 28 days. The moon joins the earth in its orbit around the sun. The moon does not give off light. Instead, its shine comes from the light it reflects from the sun. [1/2 definitions]
revolution motion in orbit around a point, or one completed cycle of this orbiting motion. [1/4 definitions]
satellite a spacecraft that is sent into orbit around a planet or other heavenly body to gather or send back information. [1/3 definitions]
space station a large spacecraft in orbit for a long period of time. Space stations are used for scientific study and for launching other spacecraft.