I find it extremely interesting that Aztec calculations could be so accurate, and that they could be so skilled as to create a piece over 25 tons. It is truly awe inspiring. Unfortunately... it is over 25 tons. I am all for taking research data and detailed pictures of the calendar, but fifty thousand pounds is a lot of weight on a spaceship, and I don't think we need to preserve it that bad. That being said, why do you think we should preserve this original, when the lessons can be gleamed without it?