With Roger Penrose I showed that if Einstein's general theory of relativity is correct, there would be a singularity, a point of infinite density and space-time curvature, where time has a beginning.

Roger Penrose 和我曾表明，如果爱因斯坦的一般相对论是正确的，那就会有一个特例，在无限密集和空间时间弯曲这一点上，时间就会有一个开端。

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