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  3. Cosmologists are still asking the same questions that the first stargazers posed as they surveyed the heavens. Where did the uni

Cosmologists are still asking the same questions that the first stargazers posed as they surveyed the heavens. Where did the uni

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问题 Cosmologists are still asking the same questions that the first stargazers posed as they surveyed the heavens. Where did the universe come from? What,if anything,preceded it? How did the universe arrive at its present state,and what will be its future? Although theorists have long speculated on the ori-gin of the cosmos,until recently they had no way to probe the universe’s earlier moments to test their hypotheses. In recent years,however,researchers have identified a method for observing the universe as it was in the very first fraction of a second after the big bang. This method involves looking for traces of gravitational waves in the cosmic microwave background,the cooled radiation that has permeated the universe for nearly 15 billion years.
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答案宇宙学家们现在仍然在问着与第一位占星家研究天空时提出的同样的问题。那就是宇宙来自哪儿?它之前又是什么东西?宇宙怎么发展到现今形态，它的未来又是什么样子?虽然理论学家们长期以来一直在思索着宇宙的起源，但迄今为止他们也找不到宇宙早期的活动情况来证明自己的推测。然而近年来科学家找到了一种方法来观测宇宙，因为它是在大爆炸的瞬间形成的。这种方法是通过在宇宙微波背景中追寻引力波的痕迹。引力波痕是几乎已经渗透在宇宙中150亿年的冷却辐射能。
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