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Sputnik 1
It was about the size of a basketball. -
Explorer 1
It discovered many magneic radiation belts around the Earth. -
Television and Infrared Observation Satellite (TIROS)
It was designed to obtain cloud pictures. -
Landsat 1 (ERTS)
It completed 4 ordits a day capturing images of the Earth as it went. -
GOES
It provided half-hourly observations of the eath and its environment.