Chapter 3: The Space Environment

Year Major Milestone in Space Exploration (note the milestone and the country or persons involved) 1232 A.D. 1772 – 1828. 1857 – 1935. December 17, 1903 March 16, 1926 October 4, 1957 October 1, 1958 August 12, 1960 April 12, 1961 February 20, 1962 July 20, 1969. May 1973. ................
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