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。
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。
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。
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。
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。
Because these galaxies' mass is spread out over larger areas, they have far fewer stars per unit volume than do conventional galaxies.
因为这些星系的质量分布在更大的区域，它们每单位体积的恒星数量比传统星系要少得多。
Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and of many of the 100 billion other galaxies estimated to exist in the universe.
最近的发现有力地支持了这样一种理论，即银河系中心，和宇宙中估计存在的1000亿个其他星系中的许多里有一个黑洞。
This orthodox view of the universe is now being challenged by astronomers who believe that a heavy "rain" of gas is falling into many galaxies from the supposedly empty space around them.
这种正统的宇宙观现在正受到天文学家的挑战。天文学家认为，一场巨大的气体“雨”正从星系周围所谓的空无一物的空间落入许多星系中。
Astronomers have long speculated that the missing baryonic mass might eventually be discovered in intergalactic space or as some large population of galaxies that are difficult to detect.
天文学家长期以来都在推测，最终可能会在星际空间或者是在难以探测的大量星系中发现丢失的重子质量。
The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars.
从可见光扩展到无线电波，再到X 射线和伽马射线，天文学总是会发现不寻常的物体，如射电星系、类星体和脉冲星。
Large galaxies grow by eating small ones.
大星系靠吃掉小星系来成长。
If two galaxies merge, so should their black holes.
如果两个星系合并，那么它们的黑洞也会合并。
Between constellations Leo and Virgo, two galaxies slowly become one.
在狮子座和室女座之间，两个星系慢慢合并成一个星系。
Now we have images of galaxies millions of light years away from Earth.
我们已经可以得到距离地球百万光年之外星系的照片了。
When one is firing, its brightness can exceed a thousand normal galaxies.
当一个类星体爆发时，它的亮度可以超越一千个常规的星系。
A myriad of galaxies in the universe are yet to be discovered for mankind.
宇宙中的无数星系等着人类去探索。
The lovely island universe resides in the large Virgo cluster of galaxies.
这个美丽的宇宙岛处在巨大的室女星系团中。
Our own Milky Way was probably created when mini-galaxies like these merged.
而我们所在的银河系可能就是由这些微型星系融合后所形成的。
Antimatter is a strange cousin to the stuff that makes up galaxies, stars and us.
反物质是组成宇宙中的星系、恒星和我们人类原材料(即指物质)的古怪堂兄弟。
So physicists proposed that the galaxies are surrounded by halos of invisible matter.
所以物理学家提出星系被不可见物质的晕圈所包围。
This trio is part of a tight clusterof 16 galaxies, many of them being dwarf galaxies.
这三个星系是一个由16个星系组成的紧密星系团的一部分，这些星系中有很多都是矮星系。
The bright, distorted object at middle, left, is actually two colliding dwarf galaxies.
在图中央偏左处的明亮扭曲天体实际上是两个相互碰撞的矮星系。
This trio is part of a tight cluster of 16 galaxies, many of them being dwarf galaxies.
这三个星系是一个由16个星系组成的紧密星系团的一部分，这些星系中有很多都是矮星系。
Elliptical galaxies do not take on the flat-disk or spiral shapes that most galaxies do.
椭圆星系并不具有大多数星系具有的扁圆或是螺旋型的形状。
Looking at very distant masers or galaxies is like looking at a photograph taken ages ago.
观察非常遥远的脉泽或者星系就像在观察很多年以前的照片一样。
In the green firmament of a slough, galaxies of duckweed are stirred by slow moving waters.
在这绿色沼泽的世界里，水中的浮萍像银河系一般在缓缓流动的水中转动着。
The next step for the astronomers is to study additional spiral galaxies at great distances.
天文学家们的下一步工作是：研究更多超远距离之外的螺旋星系。
If galaxies are moving apart now, they must therefore have been closer together in the past.
若星系现在正远离我们，那它们过去一定比现在离我们更近。
The gas within galaxies, however, does collide, and an avalanche of star formation commences.
不过，星系中的气体却会碰撞，于是恒星形成的“雪崩”过程开始了。
The gas within galaxies, however, does collide, and an avalanche of star formation commences.
不过，星系中的气体却会碰撞，于是恒星形成的“雪崩”过程开始了。
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