宇宙模型,这模型认为宇宙的平均密度足以终止星系膨胀,使宇宙进行收缩到大压缩 (Big Crunch) 阶段。
那是一个封闭的宇宙。
请注意,在一个封闭的宇宙你可以朝着一个方向开始旅行,如果允许足够的时间,最终将返回到出发点;而在一个无限的宇宙中,你永远不会回来。
Note that in a closed universe you could start a journey off in one direction and, if allowed enough time, ultimately return to your starting point; in an infinite universe, you would never return.
在封闭的宇宙中,有足够的物质阻止宇宙膨胀,最终这样的宇宙就会崩缩。
In a closed universe, there is enough matter to reverse expansion. Eventually, such a universe will collapse on itself.
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