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acrylic prints satellite acrylic prints explorer 1 acrylic prints van allen belt acrylic prints discovery acrylic prints first american acrylic prints radiation belts acrylic prints magnetosphere acrylic prints spaceflight acrylic prints space flight acrylic prints historical acrylic prints history acrylic prints 31st acrylic prints

photographs satellite photos explorer 1 photos van allen belt photos discovery photos first american photos radiation belts photos magnetosphere photos spaceflight photos space flight photos historical photos history photos 31st photos

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Explorer 1. Engineers check Explorer 1, America's first satellite, which discovered the Van Allen radiation belts around Earth. Explorer 1 was launched on 31 January 1958 by a modified Jupiter- C rocket. Explorer 1 had an integral last-stage booster rocket. It was 2 metres long and weighed 14 kilogrammes. It carried instruments designed to gather data on cosmic rays and tiny meteoroids. It orbited every 107 minutes, transmitting until 23 May 1958. Its instruments showed that there were intense belts of radiation at altitudes above 965 kilometres; these consist of charged particles that are trapped by the Earth's magnetic field. Explorer 1's orbit decayed on 31 March 1970.

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