Fifty years of space exploration, illustration
Poster commemorating 50 years of American space exploration. It shows America's first successful artificial satellite, Explorer 1 in Earth orbit. Explorer 1 was launched on 31st January 1958, after the USSR took the USA by surprise by launching the world's first artificial satellite, Sputnik 1, on 4th October 1957. It orbited Earth at heights of between 360 and 2520 kilometres until 31st March 1970., by DETLEV VAN RAVENSWAAY/SCIENCE PHOTO LIBRARY
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