Answer: In many ways space science contributed to the realization of important space applications-which may be defined as the use of space knowledge and techniques to attain practical objectives. Indeed, at the start of the program numerous potential applications required much advance research, including some space science, before their development could begin. Moreover, to many persons the development of applications appeared as the ultimate payoff of investments in the space program. Although the scientists would probably not have put it so strongly, nevertheless they could appreciate that point of view. As a consequence space scientists often pointed to potential applications of their work as one of the justifications for giving strong support to science in the space program.
Yet, in pointing to ultimate applications as one of the benefits to expect from their research, the scientists encountered a strange paradox. Although not appreciated for most of the 1960s, it finally became clear that in many respects applications-the "bread-and-butter work" of the space program-found it more difficult to gain support, especially on the executive side of government, than did space science.