没有人知道这究竟是为什么：在这一论点提出之前，大家都以为在大爆炸之后，宇宙的膨胀会渐渐慢下来。
No one knows why this should be: until that point, everyone assumed the universe's expansion would be slowing down after the big bang.
然而有些理论家现在相信他们已经找到能进一步探究的方法，也就是问那个极端问题：宇宙大爆炸之前发生了什么？
Yet some theorists now believe they have found ways of pushing back even further, to the ultimate question: what came before the big bang?
我们对早期宇宙的观察也许充满了神秘的圆环——甚至是三角形——但那并不意味着我们发现了宇宙大爆炸之前发生的事件的证据。
Our view of the early Universe may be full of mysterious circles — and even triangles — but that doesn't mean we're seeing evidence of events that took place before the Big Bang.
但即便这一圆环结构最后被证实果真是大爆炸之前的遗迹，循环宇宙的想法可能也未必是最完美的模型解释。
But even if the circles really do stem from sources in a pre-Big Bang era, cyclic cosmology may not offer the best explanation for them.
爱因斯坦的相对论作为宇宙大爆炸理论的关键基础，对大爆炸发生之前只字未提。
Einstein's General theory of Relativity, a key basis for the Big Bang theory, is silent on what happened before that event.
没有人知道这究竟是为什么：在这一论点提出之前，大家都以为在大爆炸之后，宇宙的膨胀会渐渐慢下来。
No one knows why this should be: until that point, everyone assumed the universe's expansion would be slowing down after the big bang .
没有人知道这究竟是为什么：在这一论点提出之前，大家都以为在大爆炸之后，宇宙的膨胀会渐渐慢下来。
No one knows why this should be: until that point, everyone assumed the universe's expansion would be slowing down after the big bang .
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