开放宇宙
- 网络Open universe
开放宇宙-
这样的宇宙称为开放宇宙，它的空间曲率会使三角形的内角之和小于180°。
Such a universe is said to be " open ," and its space is curved in such a way that triangles contain less than 180 ° .
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相反，若质量能量的平均密度太低的话，宇宙会无休止地膨胀下去，成为一个开放的宇宙。
On the other hand , if the mean density of mass-energy is too low , the universe will keep on expanding forever , resulting in an open universe .
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特别是，对于那些与质量密度有关的宇宙学问题，例如宇宙的封闭或开放、宇宙中的引力成团过程等等，中微子的静质量有明显的作用。
In particular , the rest-mass of neutrinos would have important influence on those cosmic problems related with mass density , such as the problems of whether the universe being open or not , the gravitational clustering in the universe , and so on .