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http://en.wikipedia.org/wiki/Timeline_of_Earth_science_satellites

The Timeline of Earth science satellites shows, in chronological order, those successful satellites with a program of Earth science. Sputnik 1, while the first satellite ever launched, did not conduct Earth science. Explorer 1 was the first satellite to make an Earth science discovery when it found the Van Allen belts.

1950s

1960s

See also

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Published in July 2009.

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