Zooming out even further and we arrive at the local group of galaxies.

再进一步缩放，我们就到达了本地星系群。

Astronomers have theorized that dark matter exists because of gravity's observed effects on galaxies and groups of galaxies.

天文学家推测，暗物质的存在是由于引力对星系和星系团的影响。

That's right, two huge groups of galaxies are physically colliding, and may eventually merge to form one huger cluster.

没错，两个巨大的星系群正在发生物理碰撞，并可能最终合并形成一个更大的星团。

There are at least 100 other groups of galaxies just like our own local group inside of here.

这里至少有一百个其他星系群，和我们的本地星系群一样。

In recent decades, we have used artificial satellites to predict the distribution of dark matter in a large group of galaxies and make detailed measurements.

近几十年来，我们利用人造卫星预测了大量星系中暗物质的分布，并进行了详细的测量。

These two dwarf galaxies are the Magellanic clouds which, together with at least 80 others, make up what's known as the local group of galaxies.

这两个矮星系是麦哲伦星云，它与至少 80 个其他星系一起，构成了所谓的本星系群。

By this point, the expansion of the universe will have pushed everything outside of our small local group of galaxies far enough away that nobody here will be able to observe them anymore.

到这个时候，宇宙的膨胀将把我们这个小星系群之外的一切都推到足够远的地方，以至于这里的人再也无法观测到它们了。

Even these coordinates would not be of much use in describing the position of the sun in our galaxy or the position of our galaxy in the local group of galaxies.

即使是这些坐标，对于描述太阳在我们银河系中的位置或我们银河系在本星系群中的位置也没有多大用处。