1918年3月的天空

星云,它们的本质、大小以及它们离我们的距离

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大众科学 Magazine Vol 118 Issue 9This article was originally published with the title “The Heavens in March, 1918” in 大众科学 Magazine Vol. 118 No. 9 (), p. 192
doi:10.1038/scientificamerican03021918-192
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