However, all these possibilities, and countless others with direct and dramatic bearing on human betterment, will not be achieved without a continuation of the dream which has carried us so far and so fast: I mean the dream of exploration, of American and human expansion into space, the greatest frontier of all. In my decision today, I have taken account of the need to fully encourage and sustain that dream.

NASA and many aerospace companies have carried out extensive design studies for the Mars mission. Congress has reviewed and approved this effort. Preparation is now sufficient for us to confidently commence a new development program. In order to completely minimize technical and economic risks, the space agency will continue to cautiously take an evolutionary approach in the development of this new system. Even so, by moving ahead at this time, we can have the first components of the Mars spacecraft in manned flight test by the end of the decade, and operational a short time later. But we will not set arbitrary deadlines, as some have called for; we will make decisions as to the pace of our program in the fullness of time and with the wisdom of experience.

It is for the reason of technological robustness that I have decided against the development of the reusable Space Shuttle at this time; despite the manifest economic benefits of such a launch system if available, I am not convinced that our technology is so mature that we are ready yet to confidently tackle the huge problems posed by the project without cost overruns and delays, and many of its economic benefits should in any case be realizable from enhancements to our existing “throwaway” platforms.

It is also significant that this major new national enterprise will engage the best efforts of thousands of highly skilled workers and hundreds of contractor firms over the next several years. The continued preeminence of America and American industry in the aerospace field will be an important part of the Mars mission’s payload.

We will go to Mars because it is the one place other than our Earth where we expect human life to be sustainable, and where our colonies could flourish. We will go to Mars because an examination of its geology and history will reflect back a greatly deepened understanding of our own precious Earth.

Above all, we will go to Mars because it will inspire us to clearly look beyond the difficulties and divisions of today, to a better future tomorrow.

“We must sail sometimes with the wind and sometimes against it,” said Oliver Wendell Holmes, “but we must sail, and not drift, nor lie at anchor.” So with man’s epic voyage into space — a voyage the United States of America has led and still shall lead. Apollo has returned to harbor. Now it is time to swiftly build new ships, and to purposefully sail farther than our ancestors could ever have dreamed possible…