Satellite knowledge

Did you know?

• Most communications satellites used for transmitting TV signals and weather information are 36,000 kilometres away from earth.
• Once a satellite comes to the end of its life cycle, it is "retired" to a "grave yard" orbit further out in space.
• Satelites use fuel as well as solar energy for the inter-orbital navigations required to remain properly positioned.
• Satellites have only the fuel that is placed on board at launch; they cannot be refuelled in space.
• Most communications satellites have a life cycle in the neighbourhood of 12 to 13 years.