A couple weeks ago, I expressed some...uncertainty about the role of science in our manned space program. Well, I just read an article about space policy addressing this issue, and there may be some cause for optimism.
Historically, science has not been the primary goal of space exploration. When first expounding on the need for a space program, the president's Science Advisory Committee outlined the purposes as follows:
"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… Second, there is the defense objective for the development of space technology…. Third, there is the factor of national prestige. To be strong and bold in space technology will enhance the prestige of the United States among the peoples of the world and create added confidence in our scientific, technological, industrial, and military strength…. Fourth, space technology affords new opportunities for scientific observation and experiment which will add to our knowledge and understanding of the earth, the solar system, and the universe."
In other words, science was the fourth most important reason for entering space. Since this time, relatively high costs (in dollars in the early '70s and in lives in the last couple of decades) have led us to rethink priorities, a process that culminated most recently in President Bush's Vision for Space Exploration. Whenever they discuss this new paradigm, these articles just cite "the
Vision", as if it was some sort of spiritual revelation. Kinda amusing.
Anyway, this re-think has led to "discovery-driven" exploration, a system that puts science first and adapts to the changing scientific landscape to pursue the most important and interesting discoveries. The most compelling scientific missions will be the ones to fly. This seems great in theory, but there are several obstacles.
First, NASA is an organization entrenched in bureaucracy, and inertia is difficult to overcome. This could be said for the space program in general, including its governmental supporters. The article notes that "When members of Congress [stress the scientific purposes of the space program], they give the impression as often as not that they are rationalizing, e.g., that having decided to support a space program out of national pride, they justify it in the name of contributions to science."
Secondly, with so many types of science having a stake in the space program (physics, astronomy, life science, agronomy, materials science, planetary science, microbiology, biophysics, etc.), it's difficult to reach a consensus as to which scientific pursuits have the most merit. But only through a concerted effort by the science community will space science missions be widely embraced by the public and funded by NASA.
And finally, this "best science wins" way of funding missions could be dangerous. If we jump around in order to get the most out of the day's hottest science mission, we would lack depth of study and sacrifice long-term investment in a sustainable exploration program. So a real challenge will be having a long-term program that will fully engage a compelling scientific problem and can still adapt to pursue new developments in science.
Not that I'm biased at all, but doesn't the search for life beyond Earth fill this need? It's a question that engages people around the world, and there are enough scientific avenues to address the question that changes can be accommodated. Now, to be fair, this is in fact a huge driver of NASA's policy, but it wouldn't hurt to make that a little more clear.