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三角視差法測量天體之間的距離可不是一件容易的事.天文學家把需要測量的天體按遠近不同分成好幾個等級.離我們比較近的天體,它們離我們最遠不超過100光年(1光年=9.461012千米),天文學家用三角視差法測量它...
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