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1915年4月3日

1分钟阅读

四月的天空

星云；其本质、尺寸和离我们的距离

作者：亨利·诺里斯·罗素

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More by Henry Norris Russell

This article was originally published with the title “The Heavens in April” in 大众科学 Magazine Vol. 112 No. 14 (April 1915), p. 318
doi:10.1038/scientificamerican04031915-318

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