Virtually all sources from the time period I've ever seen including books, magazines, TV all agree that the moon was done for $25 to $26 billion. I have seen current sources state the moon was done for around $130 billion dollars and this is accurate because the current sources are accounting for what inflation has done to the $25 billion dollar price tag since 1970. Whenever I see budget numbers, I check them against what inflation has done to see how accurate the numbers are. In the late 1960s, Mars was estimated to be around $100 billion as estimated for the Von Braun plan floating around then. The 1990 G Bush estimate for the lunar mars plans he was proposing then, was $500 Billion but this included the lunar base as well.<br /><br />Zubrins "Mars Direct" was the estimate you may be recalling. His plan was estimated by him to cost around $20 billion. NASA revised the plan, calling it 'Mars semi direct" and that plan was said by NASA to be doable for $50 billion.<br /><br />Of course, the estimate will invariably go up in this day and age of cost overruns whether planned or unplanned.<br /><br />Even at $200 billion in todays dollars, a mars plan for that price would have come in at around $40 billion in the late 1960s. A bargain compaired to the plan being proposed by Von Braun. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>