Satellites travel at 18,000 miles per hour. That means in a given day, satellites can travel the entire circumference of the Earth about 14 times. A satellite gets better fuel economy than a Prius . If you put all of the data that our satellites collect in a year on DVDs, it would form a stack nearly 4 times the height of the Empire State Building. There are over 2,500 satellites in orbit around the Earth. Digital Globe has four satellites around the world at any given moment, ready to take instant pictures of world events.
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