Abstract :
There´s a palpable longing to go back, but does it make sense? Of the nearly 7 billion people on Earth today, four out of five were not alive when the first lunar landing took place. Without a doubt, a great many of them would love to see people back on the Moon again. But does it make sense to spend the US $50 billion it might cost to get them there? Do we need a base on the Moon to get to Mars? And if not, should we bother going to the Moon at all?
