TIMELINE OF EARTH SCIENCE SATELLITES

By vinsond

  • Explorer 1; US; Decayed 31 May 1970. Discovered Van Allen belts

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    Timeline of EARTH SCIENCE SATELLITES

  • Explorer 2; US, Failed to orbit

  • Vanguard I, US Oldest artificial satellite in orbit

  • Explorer 3; US; Decayed 28 June 1958

  • Sputnik; Soviet Union; Fail to orbit

  • Explorer 4; US; Measured electrons & protons in radiation belts. Also measured data on Operation Argus nuclear explosion

  • Vanguard II; US; Still in Orbit

  • Explorer 6; US; Decayed 1 July 1961

  • Vanguard III; US; Still in orbit

  • Explorer 11; US; Still in orbit

  • Explorer 900;US; Still in orbit

  • Kosmos 3; Soviet Union; Still in orbit

  • Explorer 15; US; Still in orbit