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A satellite nation is a nation that appears to be sovereign, but is actually under the control of another nation. Examples would be nations such as Hungary and Poland under the USSR.
Satellites are objects orbiting a planet. The moon is a natural satellite. Artificial satellites are those put into orbit by man. The first artificial satellite was Sputnik I launched by the Soviet Union in 1957. Now almost fifty years later there are thousands of satellites orbiting the Earth at various heights.