From sitting at the center of the universe, we now find ourselves orbiting an average-sized sun, which is just one of millions of stars in our own Milky Way galaxy.

过去我们自认为是宇宙的中心，现在发觉我们围绕一颗体积中等的太阳在转，而太阳只是银河系中数百万颗恒星中的一颗。

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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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Their standard model treats the universe as though its density did not vary from place to place but had a uniform, average value of one atom per cubic meter.

标准模型将宇宙视为一个均匀结构，密度不会随著空间位置而变化，每立方公尺平均有一个原子。

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