The puzzle of the cosmic age is a long-standing key problem in big bang cosmology.

第一推动力是伴随着宇宙大爆炸的发生一并出现的，它在本质上是一种惯性力。

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The Big Bang model of cosmology rests on two key ideas that date back to the early 20th century: General Relativity and the Cosmological Principle.

宇宙学中的大爆炸模型可以追溯到20世纪初的两个核心思想：广义相对论和宇宙学原理。

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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.

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。

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Neither the Big Bang, nor the Steady State versions of cosmology account for any but the lightest elements hydrogen and helium.

ECONOMIST: Sir Fred Hoyle