An artificial satellite is a manmade object placed into planetary orbit to perform specific functions. Some satellites are used for communications, weather forecasts, geographical surveys or for military purposes. Satellites can travel across the polar regions, follow a course around the equator or orbit deep into space.
The United States leads in the most number of operational satellites at 512, followed by Russia at 135 and China at 116. Out of 512 satellites, 159 of these are intended for the U.S. military.Learn more about Planets