USA 1958, International Geophysical Year 3 c

USA stamp 1958

International Geophysical Year 3 cents

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The International Geophysical Year (IGY) was an international scientific project that lasted from July 1, 1957, to December 31, 1958.

The IGY encompassed eleven Earth sciences: aurora and airglow, cosmic rays, geomagnetism, gravity, ionospheric physics, longitude and latitude determinations (precision mapping), meteorology, oceanography, seismology and solar activity.

Both the Soviet Union and the U.S. launched artificial satellites for this event; the Soviet Union's Sputnik 1 October 4 1957 was the first successful artificial satellite. Other significant achievements of the IGY included the discovery of the Van Allen radiation belts and the discovery of mid-ocean submarine ridges, an important confirmation of plate tectonics. Also detected was the rare occurrence of hard solar corpuscular radiation that could be highly dangerous for manned space flight.