satellite

a  [count] : an object (such as a moon) that moves around a much larger planet

b  : a machine that is sent into space and that moves around the earth, moon, sun, or a planet

◊ Satellites are used for radio, television, and other types of communication and for studying the objects they move around.

— often used before another noun

[count] : a country, organization, etc., that is controlled by a larger and more powerful country, organization, etc.