Description
我们都知道光的波长和空间膨胀之间的关系。也听说过随着空间的膨胀，辐射的波长会被拉长，光损失能量！我们也经常能看到一些形象的类比，例如：画在气球上的波浪，随着气球的膨胀波就会被拉长。但是我们会想，光为什么不能继续，保持它的频率和波长，不管它周围的空间是膨胀还是收缩呢？
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