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1·Galaxies tend to clump together in clusters.

星系往往聚集形成星团。《牛津词典》

2·They turned their telescopes toward other nearby galaxies.

他们把望远镜转向附近的其他星系。《柯林斯英汉双解大词典》

3·This has led scientists to speculate on the existence of other galaxies.

这就使得科学家推测还有其他星系存在。《牛津词典》

4·To explain this, they hypothesize that galaxies must contain a great deal of missing matter which cannot be detected.

为了解释这一点，他们假定银河系一定包含了大量无法探测到的不明物质。《柯林斯英汉双解大词典》

5·Only galaxies with a spherical bulge—like component appear to accommodate supermassive black holes.

只有拥有球形膨胀物质的星系才可能容纳超大质量的黑洞。

6·Our galaxy is so huge that dozens of lesser galaxies scamper about it, like moons orbiting a giant planet.

我们的银河系实在庞大，吸引着数十个较小的星系环绕着它奔跑，恰似环绕巨大行星旋转的卫星。

7·These galaxies may constitute an answer to the long-standing puzzle of the missing baryonic mass in the universe.

这些星系可能为宇宙中长期存在的缺少重子质量这一谜题提供了答案。

8·Over billions of years, the gas was compressed by gravity into galaxies, stars, plants and eventually, even humans.

在数十亿年的时间里，这些气体被引力压缩成星系、恒星、植物，最终甚至变成了人类。

9·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。

10·In addition to conventional galaxies, the universe contains very dim galaxies that until recently went unnoticed by astronomers.

除了传统的星系，宇宙中还有一些非常暗淡的星系，直到最近才被天文学家发现。

(1)milky way galaxy银河系

(1)galaxy securitiesn. 中国银河证券有限责任公司

(1)spiral galaxyn. 螺旋星云（等于spiral nebula）

(1)andromeda galaxy仙女座星系；仙女座星云

(1)galaxy cluster星系团

(1)galaxy hotel银河商务酒店；银河宾馆