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Big Blue Marble
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Big Blue Marble

April 19, 2011
NASA's mission has always been to explore, to discover and to understand the world in which we live from the unique vantage point of space, and to share our newly gained perspectives with the public. That spirit of sharing remains true today as NASA operates 18 of the most advanced Earth-observing satellites ever built, helping scientists make some of the most detailed observations ever made of our world.