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  • Have you ever had the feeling that there's something bigger out there, something you can't see?

    你曾經感覺有一種更龐大的東西存在嗎?一種看不見的東西?

  • Well, there is. It's called Dark Matter.

    事實上是有的,它叫「暗物質」。

  • Dark matter is spread throughout space, engulfing the Milky Way and all other galaxies.

    暗物質在宇宙間無所不在,包圍著銀河系和其他所有星系。

  • It's four times more common in the universe than visible matter, yet we've never seen or directly observed it!

    暗物質是宇宙中可見物質的四倍之多,但我們卻無法看見或直接觀察它!

  • So how do we know it's there? Because of gravity.

    那我們如何知道它的存在?因為引力。

  • A galaxy is like a giant merry-go-round that all the stars are riding.

    星系就像個大型旋轉木馬,上面承載著所有恆星。

  • In order to stay on, each star has to hold on tightthat's where gravity comes inotherwise it'll fly off into space.

    為了坐穩,每顆恆星都得抓緊——這就是引力來源——否則它就會被甩進太空。

  • The problem is, the force of gravity from all the stars we can see isn't strong enough to hold galaxies together.

    問題是,所有可觀測的恆星所產生之引力都不夠強,無法將星系維繫在一起。

  • All the stars should be flying off the edge of the merry-go-round. But they're not.

    換言之,所有的恆星早就該被甩下旋轉木馬了!

  • It's as if some invisible rope is helping them hold on.

    但它們沒有,就好像有條隱形的繩索在支撐它們一樣。

  • Physicists believe that rope is the gravitational force from stuff we can't see, hence, Dark Matter.

    物理學家們相信,那條「繩子」是某種不可見物質所產生的引力,也就是「暗物質」。

  • And how do we know the speeds of stars in distant galaxies?

    那我們如何知道遙遠星系中,恆星的速度呢?

  • The doppler effect, which is why a police siren shifts to a lower pitch as the car passes, also works for light.

    都卜勒效應,就是警車經過後,警笛聲調降低的原理,會告訴我們,這原理也可運用於光線。

  • That's how radar catches you speeding, and how astronomers measure the rotation of galaxies.

    正因如此,雷達才能抓到超速車輛、天文學家才能測量星系的運轉情況。

  • So, we use what we can see to tell us about what we can't.

    所以,我們可以利用冰山一角窺視宇宙全貌(以「可見」推論「不可見」)。

Have you ever had the feeling that there's something bigger out there, something you can't see?

你曾經感覺有一種更龐大的東西存在嗎?一種看不見的東西?

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B2 中高級 中文 美國腔 星系 恆星 物質 引力 宇宙 原理

什麼是暗物質?一分鐘物理學教告訴你! (Minute Physics: What is Dark Matter?)

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    劉峻宏 發佈於 2021 年 12 月 27 日
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