| Figure 1. Illustrations of the principle of propelling an object into a durable orbit about the Earth. The diagram on the right is from Isaac Newton's De Mundi Systematic (1731 Edition) and the one on the left is a modern adaptation thereof (G. Abell, Exploration of the Universe, 4th Ed., Saunders College Publishing, New York, 1982). |
Previous Slide | Next Slide
Speech
| Slides | About the Author
Presidential Lecture Home