Until recently most astronomers believed that the space between the galaxies in our universe was a near-perfect vacuum.

直到最近，大多数天文学家都认为我们宇宙中星系之间的空间是近乎完美的真空。

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In fact, 24 per cent of our galaxy elemental mass consists of helium, which makes it the second most abundant element in our universe.

事实上，银河系中24%的元素质量是由氦组成的，这使它成为宇宙中第二丰富的元素。

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One of the key scientific questions in cosmology today is: what is the average density of matter in our universe?

今天宇宙学的一个关键问题就是：宇宙中物质的平均密度是多少？

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Hubble's discovery meant a major change in our idea of the universe.

VOA: special.2009.04.29

We're able to think about the farthest reaches of the universe and ask what our place is in the universe.

我们可以思考宇宙最远的可到达处,并问我们在宇宙中的位置是什么。

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And where we where at the start of the 20th Century in the late 1890's is that we were at a place where there was great confidence in our understanding of the universe, and our understanding of how all matter worked.

0世纪开始讲起,在19世纪的九十年代,人们对于自己,对自然的理解,对自然所有物质,如何工作的理解十分自信。

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The ValuEngine Valuation Model is based upon twenty fundamental data points for each stock in our universe of 5, 500 stocks.

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Currently, our Valuation Model finds that the percentage of undervalued stocks in our universe of more than 5, 500 equities is 81%.

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Consider the number of stars in our universe on the order of 10(e21).

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