Satellite Life Time

While space itself is infinite, the ideal orbits for satellites are not. Communications, weather and television satellites are typically placed in geostationary orbits above the equator, where they remain in one position over the earth. This band now contains hundreds of objects. Geostationary orbits are what allows a television satellite dish to remain in a fixed position.
Polar orbits are useful for mapping and photographing objects on the ground. The satellite stays in a single track, collecting information at the earth rotates below it. This orbit covers more area than any other type. NOAA uses polar orbits as part of its Search and Rescue Satellite program (SARSAT).
When a satellite is no longer able to function, it may continue to orbit or slowly fall into the atmosphere. Either fate can result in hazards to functional satellites, spacecraft, or even people on the ground. There is currently no practical way to collect and dispose of space junk.