Description
宇宙的膨胀是宇宙两个遥远部分之间的距离随时间的增加而增加。这是一种内在的膨胀，随着空间尺度的变化而变化，宇宙不会膨胀成任何东西，也不需要外部空间存在。从技术上来讲，空间和空间中的物体都不会移动，相反的，是控制时空大小和几何形状的规度本身在尺度上发生了变化。虽然光和时空中的物体的速度不能超过光速，但这个限制并不限制规度本身。从观察着的角度来看太空在膨胀，除了最近的星系外所有的星系都在向远处退宿。
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