If the expansion of the universe is to stop there must be enough invisible matter in the universe to exceed the luminous matter in density by a factor of roughly 70.
如果要让宇宙停止扩大，那就必须要有超过可见物质密度约70倍的不可见物质存在。
If the expansion of the universe is to stop, there must be enough invisible matter in the universe to exceed the luminous matter in density by a factor of roughly 70.
要使宇宙停止扩张，必须要有足够的不可见物质，远远超过发光物质，其密度大约是70倍。
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