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浩繁的星空，天体之间相距遥远．例如，地球到太阳的平均距离为1
浩繁的星空，天体之间相距遥远．例如，地球到太阳的平均距离为1个天文单位（AU），1AU=1．496×1011m，若不考虑地球大气层等因素对太阳光传播过程的影响，那么，太阳
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