大爆炸模型认为，现在的一切，包括曾经在一个近乎无限密度的单点集中的宇宙。
The Big Bang model holds that everything that now comprises the universe was once concentrated in a single point of near-infinite density.
所以当一个巨大的恒星自我爆炸，它将继续一直爆炸，直至到达无限密度的一个点。
So when a massive star collapses in on itself, it will keep and keep collapsing until it gets to a point of infinite density.
如果密度正好等于临界密度，宇宙则是平坦的，但很可能仍然是无限的。
If the density just equals the critical density, the universe is flat, but still presumably infinite.
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