Since Moon is cheaper then Mars, lets take a look
So there are 2 things needed:
- Cash
- Space Program
You already have a Space Program, lets see how much the Moon Base would cost for you
Your Nation Strength: 94,110.795
Your Technology: 9,239.87
So that is
50,000,000 + (3,000 * (94,110.795 - (9,239.87 * 2))) = 276,893,165.00
So the Moon Base will only show up if you have at least 277 milion cash
Mars Base would currently cost 100,000,000 + (6,000 * (94,110.795 - (T9,239.87 * 2))) = 553,786,330.00
So if you haven't purchased a wonder in the last 30 days and paid your bills in the last 2 days, the Moon Base will show up if you have more then 277 milion. If not, it will not show up