"他们是怎么知道的"

当天文学家谈论距离远达 60,000,000,000,000,000,000 英里或更远的星系时,他们是如何得出如此惊人数字的?

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大众科学 Magazine Vol 137 Issue 5This article was originally published with the title “How do they Know” in 大众科学 Magazine Vol. 137 No. 5 (), p. 402
doi:10.1038/scientificamerican1127-402
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