原文由 gm01111 於 06-9-26 22:35 發表 1光年(LY)係光行走一年的距離,已知光速為:3x108 m/sec. ,且 1mile = 1.61km,1mile = 5280 ft,1 ft = 12 in. ,1 in. = 2.54 cm。試求 1 LY = ? km = ? mile = ? ft = ? in