1920年七月的天象

物质运动速度达每秒七百五十英里的地方

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大众科学 Magazine Vol 122 Issue 26This article was originally published with the title “The Heavens in July, 1920” in 大众科学 Magazine Vol. 122 No. 26 (), p. 706
doi:10.1038/scientificamerican06261920-706
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