当宇宙扩张之时，星系的大小保持不变。
这才是一个平衡的系统，所以宇宙不是无限扩张的。
This is a balanced system, thus the universe is not limitlessly expanding.
“大爆炸”这个词指的是宇宙开始扩张的那个时间点。
The term "Big Bang" actually refers to the moment when the universe started expanding.
宇宙会一直扩张下去吗？
宇宙在不断扩张的观点已经得到证明，不再仅仅是理论了。
The belief that the universe is expanding has been proven and is no longer theoretical.
宇宙在不断扩张的观点已经得到证明，不再仅仅是理论了。
The belief that the universe is expanding has been proven and is no longer theoretical.
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