Name: 【TED-Ed】看不見不代表不存在：暗物質 Dark matter: The matter we can't see - James Gillies
Uploaded: 2013-05-13T08:30:09.000Z
Duration: 5 min 35 s

古代希臘人有一個偉大的想法：

all you needed to make it were four elements:

就像它的理論一樣， 這是美麗的。

the four basic elements in different ways,

you could produce all the wonderful diversity of the universe.

而空氣加水，就會得到濕的東西。

但依照這理論， 會有一個問題。

It didn't predict anything that could be measured,

它沒辦法預測出任何 可以測量的事物，

and measurement is the basis of experimental science.

But the Greeks were great scientists of the mind

但希臘人仍是 思想上偉大的科學家，

米勒都的留基伯（Leucippus of Miletus）

with one of the most enduring scientific ideas ever.

提出有史以來 最經得起考驗的科學思想之一。

of tiny, indivisible bits of stuff called atoms.

都由微小、看不見的東西組成， 這東西稱作原子。

而它超越 土、空氣、水、火的理論

over the earth, air, fire, and water theory

Centuries of scientific thought and experimentation

In Leucippus's theory, the atom is the smallest,

在留基伯的理論中，原子是最小的、

indivisible bit of stuff that's still recognizable

看不見的物質， 但仍然可以作區分，

The only thing wrong with Leucippus's idea

留基伯的想法裡， 唯一有問題的是

只解釋了宇宙組成 的一小部份。

What appears to be the ordinary stuff of the universe

平常所見到的物質， 實際上在宇宙中

Leucippus's atoms, and the things they're made of,

留基伯討論的原子、 還有它們組成的物質，

Physicists know the rest of the universe,

All the stuff that's made of atoms is visible.

所有原子組成的物質 是看得見的。

它會反射光線， 然後我們就看得到。

有些就像我們居住的地方一樣，

are beautiful, spiral shapes, spinning gracefully through space.

很美麗、有螺旋的結構、 優雅地在太空中旋轉。

When scientists first measured the motion

and weighed the amount of matter they contained,

They found that there's not enough visible stuff

他們發現 並沒有足夠的可見物質

Later measurements of individual galaxies

There's simply not enough visible stuff in galaxies

星系裡就是沒有足夠的 可見物質

to provide enough gravity to hold them together.

來提供足夠的重力 讓它們靠在一起。

它們應該向外飛走， 但並沒有。

and that we're residents of a fairly ordinary planet,

而我們只是 一顆平凡行星上的居民，

in the spiral arm of a fairly ordinary galaxy.

座落在一個平凡星系的螺旋臂上。

one step further away from the center of things.

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【TED-Ed】看不見不代表不存在：暗物質　Dark matter: The matter we can't see - James Gillies

stuff

matter

evidence

great