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physical astronomy 天體力學,引力天文學。

physical beauty

We assume that the physical laws we discovered on or near the earth can be applied to anywhere in the universe . would it be false , we can talk no more about physical astronomy 我們假設人類所知的物理定律,亦普遍適用于宇宙任何一個角落,沒有了這個假設便萬事皆休,甚么天文物理便會失去一切意義。