A picture of Manhattan taken by a Landsat satellite on the terrible Tuesday of September 11th in 2001. Credit NASA.

Today NASA celebrates the 40th anniversary of the Landsat satellite program. The program consists of a series of Earth-observing satellite missions which are jointly managed by NASA and the United States Geological Survey. And since 1972 the Landsat satellites have collected information about Earth from their orbit in space.

 

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http://landsat.gsfc.nasa.gov/

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