Witness the Moon's breathtaking 4.5-billion-year evolution in less than …

When we gaze up at the Moon, we expect a certain degree of consistency. Sure, it moves through its phases, shifting in and out of darkness over the course of the month, but generally speaking, the Moon's surface looks the same to us — night after night, year after year. But the Moon has not always looked the way it… » 3/14/12 1:20pm 3/14/12 1:20pm