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national geographic nat geo natgeo animals wildlife science explore discover survival nature documentary moon moon phases night sky full moon lunar eclipse PLivjPDlt6ApRfQqtRw7JkGCLvezGeMBB2 PLivjPDlt6ApRiBHpsyXWG22G8RPNZ6jlb PLivjPDlt6ApS90YoAu-T8VIj6awyflIym PLivjPDlt6ApRpidjp1zjROOCKru-89Q1_ moon made of moon's violent origins moon's violent violent origins earliest calendars calendars first explored explored Earth natural satellite half a century century ago