A satellite is any object which orbits another object. All bodies that are part of solar system, for example the Earth and Jupiter, are satellites. Most of these bodies orbit the sun, but others orbit planets. For example, the moon orbits the Earth. When we use the term 'satellite', we usually mean an artificial satellite. This is a man-made object that orbits the Earth, or the other body. However, scientists may also use the term for natural satellites, or moons.
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