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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Without this data from the cosmic microwave background, we can still learn a whole lot about the Universe, including its age, the presence of dark matter and dark energy.

如果没有这个来自宇宙微波背景的数据，我们仍可以去了解整个宇宙，包括其年龄，暗物质和暗能量的存在等等。

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We pondered, as so many did then and since, on the vastness of the Universe asking the age-old questions, the “who”, “when” and “why” of that most puzzling of cosmic conundrums[5].

和同时代以及后来许多人一样，我们思索宇宙的浩瀚，问古老的问题——有关宇宙的起源的“谁”、“何时”以及“为什么”，这可是所有宇宙难题中最令人困惑和费解的。

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The dawn of a new age has undoubtedly put many in a cosmic mood.

CNN: New Year's Eve on the Net

We have basically the building blocks of the solar system preserved in this sort of cosmic library, if you will, for the entire age of the solar system and preserved at very low temperatures.

NPR: Stardust Set to Deliver Comet Samples

To address these outstanding questions, the team will collect samples of rock to date their exposure to cosmic radiation and analyse how glaciers and ice have retreated since the last ice age, around 20, 000 years ago.

BBC: Polar expedition to study Antarctica's climate history