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Everything we've seen so far is inside the Milk Way
到目前為止，我們看到一切都在銀河內
Now we're ready to leave our home galaxy
我們準備離開我們的星系
to enter intergalactic space.
進入星系際空間
Here's our chance to solve the ultimate mystery
或許我們可以找到機會回答終極問題
and experience the moment of creation.
并有機會去經歷創世的一刻
Beyond the Milk Way
離開銀河
through the vast expanse between galaxies.
穿越星系間巨大空間
Against all the odds, we've made it to intergalactic space
排除萬難，進入星系際空間
Out here, there's no horizon in sight.
這里看不到地平線
Even the closest galaxies are hundreds of thousands of light years away
即使最近的星系也遠在數十萬光年外
The remains of galaxies ripped apart
被銀河系巨大引力
By the Milky Way's huge gravitational pull
撕碎的其他星系的殘骸
scattered among nothing
散布在空無之中
This is as close as the universe gets to a perfect vacuum.
這是宇宙中最接近完美真空的地方
But even this isn't totally empty.
但即使這里也不是完全真空
There are thin wisps of gas, tine traces of dust
這里有稀薄的氣體，微量的塵埃
And something else, dark matter
還有其他的東西，暗物質
So mysterious, we can't see it
神秘的暗物質，我們無法看見、
feel it, taste it, touch it or even measure it.
感覺、品嘗、觸摸甚至不能測量
Yet so common, it could make up over 90 percent
然而又很普通，它有可能占我們宇宙中所有物質
of all the matter in the universe.
十分之九
If dark matter does exist..
如果暗物質的確存在
it means there's no such thing as empty space.
那就不存在真空這回事了
Even out here, we're surrounded by matter
即使在這里，我們也是被物質包圍著
We think it exists because of its apparent hold on galaxies
由于星系間明顯的引力我們才認為存在暗物質
Like this one, the Large Magellanic Cloud
例如大麥哲倫星云
A 6-billion-year journey in today's fastest spacecraft
它距離銀河系16萬光年，即使現在最快的太空飛船
160 thousand light years from the Milky Way
也要飛行60億年
at the edge of its gravitational reach
它正處于銀河系引力的邊緣
This galaxy should spin off into space, but something is holding it here
這個星系應該被卷進太空，但某些東西把它固定在這里
something invisible, powerful, dark matter
某種看不見卻強大的東西，是暗物質
Stars, clusters of stars, nebulae
恒星、星團、星云
it's a vast astronomical treasure trove.
它是巨大的天文寶庫
