Satellites are transported to space by carrier rockets. During the launch, the satellites mostly have a covering of metal, which protects them against wind, light, dust, air pressure, and the heat resulting from the friction they experience while passing at high speed through the atmosphere. This cover is discarded later on during the journey. During a satellite launch, the thrust of the carrier rockets is calculated in such a way that the satellite swings into its allotted position at the correct height and starts orbiting at a predetermined speed around the Earth. A television satellite thus revolves around the Earth. A television satellite thus revolves around the Earth once in exactly 24 hours. Solar sails draw energy from sunlight to generate the power needed to operate satellites.
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