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"Since NASA launched the first Landsat satellite in 1972, the program has been in constant operation. Seven other satellites followed the first into orbit over the years, sometimes replacing ones that had reached the end of their operational life, sometimes joining ones still in operation. The most recent member of the fleet, Landsat 8, went aloft in February. At an altitude of 438 miles (705 km), the satellites make one orbit of Earth every 84.3 minutes. Keep that up for 41 years, maintaining a photographic record of your travels, and you compile a whole lot of pictures — millions of them, which have since been digitized into petabytes, or billions of bytes of data."
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