Old satellites orbiting near the Earth eventually fall back into the atmosphere and burn. Satellites orbiting farther away stay in orbit indefinitely.
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Wheather satellites are used to take close pictures of the earth . Communication satellites are used for communication. Ex(in the old days if you sent a letter from Canada to Russia it would take 25 days. Now you write in MSN, it goes to the satellite and to the reciever.)
There are no known satellites of Mercury.
Triangulation of satellites requires three satellites that bank of one another simultaneously.
Yes but they are called natural satellites
CORRECT ANSWER:No.