Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
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| International Geophysical Year Igy |
The period from 1 July 1957 to 31 December 1958 during which an internationally coordinated programme of geophysical research was organized to coincide with a period of maximum solar activity.
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