Scientists using this theory to trace our universe backward in time have found that its beginning point had a minimum volume that is not zero and a maximum energy that is not infinite.

科学家使用该理论追踪我们的早期宇宙，发现宇宙开始点拥有一个最小的体积，但是并不是零，一个最大的能量但不是无穷大。

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Quantum theory started at the beginning of the 20th century, in part with work on light.

量子理论始于20世纪初，是光学研究的一部分。

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This was predicted by Einstein's theory of relativity at the beginning of the 20th centaury and has since been proved many times.

这一点由爱因斯坦在20世纪初做出预言，并且多次得到证明。

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But it is also almost certainly the beginning of that theory's undoing, and its replacement by something better.

ECONOMIST: The hunt for physics��s most elusive quarry is over

Kempton's theory is beginning to win applause from some car and utility folks, but daunting technical and economic obstacles make it a tough sell.

FORBES: Magazine Article

And a theory of its beginning, known as inflation, is correct.

ECONOMIST: The universe