Clusters of galaxies also clump together to form superclusters, the largest structures in the Universe.

星系团也聚集在一起形成超星系团——宇宙中最大的结构体。

Within a given supercluster, all galaxy motions will be directed inward, toward the center of mass.

而在超星系团内部，所有星系都是向内部质心运动。

But even the massive Virgo supercluster is nothing but a quiet and tiny lobe of the great Laniakea Supercluster.

但是，即使是巨大的处女座超星系团，也只不过是拉尼亚克亚超星系团中一个安静而微小的裂片而已。

Superclusters are some of the universe's largest structures, and have boundaries that are tough to define—especially from inside one.

超星系团是宇宙中最大的组织结构，并且很难定义各个星系团的边界，尤其是内部的星系。

A supercluster usually has several dozen clusters making it up, and are hundreds of millions of light years across.

一个超星系团通常由几十个星系团组成，其直径达数亿光年。

Others are densely packed with galaxies in regions known as superclusters.

其他星系在被称为超星系团的区域中密密麻麻地挤满了星系。

When you look at all these pictures of galaxies, of clusters, of superclusters, a question pops up: How many galaxies are there?

当你看到这些星系、星系团、超星系团的照片时，就会出现一个问题：有多少星系呢？

The acceleration becomes so rapid that all objects that are beyond our or any local supercluster of galaxies are no longer visible.

加速度变得如此之快，以至于超出我们或任何一个星系超星系团的物体都不再可见。

Surveys of the sky have revealed that not only do galaxies clump together in clusters, but clusters themselves fall into even bigger groups called superclusters!

对天空的调查显示，不仅星系会聚集在一起形成星系团，星系团本身还会变成更大的群——超星系团！

Here's our supercluster (in black) and a neighbouring structure, Perseus-Pisces (in red).

这是我们的超星系团（黑色）和邻近的结构，英仙座-双鱼座（红色）。

This is the first clear definition of a supercluster.

这是超星系团的第一个明确定义。

Our Local Group belongs to an even bigger collection of galaxies called the Virgo supercluster, and this supercluster belongs to an even larger supercluster, known as Laniakea.

本星系群属于更大的星系集合叫做室女超星系团，而它又属于另一个更大的超星系团叫做兰天超星系团。

Researchers, led by an astronomer at the University of Hawaii at Manoa, have named this supercluster Laniakea, which means immense heaven in Hawaiian.

在夏威夷马诺亚大学一位天文学家领导下的研究人员们将此超星系团命名为兰天，夏威夷语意思是广袤无垠的天堂。

Superclusters are the biggest structures found in the Universe, but scientists have struggled to define where one ends and another begins.

超星系团是宇宙中发现的最大结构，但科学家们一直在努力定义一个结束的地方和另一个开始的地方。

Delving into our home supercluster, you can see that most galaxies are being pulled towards a dense centre.

深入研究我们的家庭超星系团，您可以看到大多数星系都被拉向一个密集的中心。

What will eventually happen is that Laniakea itself will come apart, and all the galaxies within this supercluster will start to drift even further apart.

最终会发生的是兰天超星系团的瓦解，这个超星系团所有的星系都会开始进一步漂移，越离越远。

This cluster of clusters is merely an appendage of a much larger supercluster, more than 100 times bigger and more massive.

这个星团群只是一个更大的超星系团的附属物，超星系团比它大 100 多倍，质量也更大。

Some scientists suggest there might be Type 4 and Type 5 civilizations, whose influence stretches over galaxy clusters or superclusters, structures comprising thousands of galaxies and trillions of stars.

一些科学家认为可能存在着4型和5型文明，他们的影响延伸包括数千个星系和数万亿颗恒星的星系团或超星系团。

We've come a long way together, you and I, from the banging beginning of the Universe to its far, far, future; from subatomic scales to superclusters of galaxies.

我们一起走过了漫长的道路，从宇宙大爆炸开始，到遥远的未来；从亚原子尺度到超星系团。

Together these descriptions almost perfectly reproduce the evolution of the kinds of large-scale structures that astronomers observe in the universe today—galaxies, galactic clusters and gargantuan galactic superclusters.

这些描述几乎完美地再现了当今天文学家在宇宙中观察到的各种大型结构的演变——星系、星系团和庞大的星系超星系团。