... explanation, even after 2 years of relatively high-geared activity in the space exploration field, appears to be warranted. There is still a segment of the U.S. population which has little, if any, notion of the values that the space program has for the average citizen. To these people the expenditure of billions of dollars on missiles, rockets, satellites, Moon probes, and other space activities remains something of a mystery—particularly when so many other worthy ... — The Practical Values of Space Exploration • Committee on Science and Astronautics