随着星系对离我们越来越远，它们之间的相互距离却在缩小，就像一个尺子在远方看，单位间隔会变小一样。
The separation appears to get smaller as the galaxies move farther away, just like a ruler of fixed length (right-hand illustration).
随着星系对离我们越来越远，它们之间的相互距离却在缩小，就像一个尺子在远方看，单位间隔会变小一样。
The separation appears to get smaller as the galaxies move farther away, just like a ruler of fixed length (right-hand illustration).
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