As we look forward to a major lunar event on Sunday night -- the supermoon lunar eclipse -- it's time to take a look back at how our understanding of Earth's only (permanent) natural satellite has changed since the dawn of the Space Age.
In the more than four decades since humans walked on the moon, a heck of a lot has changed. We've changed space programs and vehicles a few times, expanded our horizons to international missions, and sent spacecraft across the solar system. For about 20 years, NASA didn't look much at the moon, but ...
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