(Received 5 March 1973; accepted 13 September 1973)
Published Online: April
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Gravity began to slacken its hold on man fifteen years ago, when Sputnik and Explorer 1 first succeeded in loosening the Promethean bonds that had been inviolate for perhaps five billion years. In orbiting and escaping Earth, we have again demonstrated the validity of the great physical laws of Kepler, of Newton, of Einstein. And, inevitably, we have also generated much new knowledge as we have launched satellites around our planet and flown men to the Moon and instruments to Venus and Mars.
Director, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, Calif.
Stock #: JFS10166J