It is useful to distinguish among four factors which give importance, urgency, and inevitability to the advancement of space technology. The first of these factors is the compelling urge of man to explore and to discover, the thrust of curiosity that leads men to try to go where no one has gone before.
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Citation
Killian, James R. "Introduction to Outer Space." Project Mercury: Man-in-space Program of the National Aeronautics and Space Administration. U.S. Government Printing Office, 1959. Originally a speech given on 26 Mar. 1958. The White House, Washington, DC, USA.