外面有着更多的暗星系？
All three are large spiral galaxies.
这3个星系都是巨大的棒旋星系。
How Galaxies Could Get Gravity boost?
星系如果获得引力助推力。
Which came first, black holes or galaxies?
是先有黑洞呢？还是先有星系？
Still, elliptical galaxies can be very large.
但椭圆星系可以非常巨大。
Two galaxies have obviously just collided.
两个星系显然是撞击过了。
Sure enough, they found a cluster of galaxies.
很明确，他们发现了一个星系群。
Is there any other form of life in the galaxies?
星系里有其他形式匠生命吗？
NEW STUDY: Mystery Matter Helped Build First galaxies.
新研究：神秘物质帮助最初的星系建立。
Few new stars are known to form in elliptical galaxies.
几乎没有已知的新恒星形成于椭圆星系。
OUR TANGLED UNIVERSE: How the First Galaxies Were born.
我们纠结的宇宙：最初的星系是如何诞生的？
Nowadays, many nebulae are known to be galaxies instead.
我们现在已经熟知的许多星系过去也被称为星云。
The two galaxies on the far left were unknown until 1968.
最左边的两个星系直到1968年还是未知区域。
This galaxy however, is one of the mass galaxies in.
而这个银河系，只是天上众多银河系之一。
Are the galaxies in the universe moving through space?
太空中的各个星系都在其间移动吗？
We had to rethink our ideas of how galaxies were made.
我们不得不重新审视我们对星系形成的认识。
Galaxies throughout the universe are ablaze with star birth.
遍布宇宙各处的星系都闪耀着恒星诞生的光芒。
It is one of the most famous spiral galaxies in the sky.
这是宇宙中的一个非常著名的螺旋状星系。
Most galaxies occur in pairs or in small multiple groups.
大多数星系成双或几个成一小群。
However, the distance between the galaxies does increase.
然而，星系之间的距离确实在不断增加。
Julia: in reality, we belong to one galaxy in a sea of galaxies.
朱莉娅：现实中，我们只是星系海洋中的一个星系。
The spiral shapes of two of these galaxies appear mostly intact.
这些星系中两个螺旋形状的看起来比较完整。
Satellite galaxies of the Milky Way usually perish in its grasp.
银河系的卫星星系通常在其范围内消亡。
As the universe expands, these galaxies stay the same size.
当宇宙扩张之时，星系的大小保持不变。
This galaxy however, is one of the mass galaxies in the sky.
而这个银河系，只是天上众多银河系之一。
Explanation: What's the matter with this cluster of galaxies?
解说：这个星群怎么了？
We haven't even begun to map the many galaxies that we know exist.
我们甚至对我们已知的星系都没进行勘测呢。
We haven't even begun to map the many galaxies that we know exist.
我们甚至对我们已知的星系都没进行勘测呢。
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