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  • Light travels at about 1 foot per nanosecond.

    光的傳播速度大約是每納秒1英尺。

  • Hold your hand up 12 inches from your face: you're seeing your hand as it was a nanosecond

    把你的手舉到離你的臉12英寸的地方:你看到的是你的手,因為它是一納秒。

  • ago.

    前。

  • Everything you look at is, to one degree or another, in the past.

    你所看的一切,或多或少都是過去的事。

  • The farther away in space, the more ancient in time.

    空間越遠,時間越古老。

  • You can't see the Sun as it is now, but you can see it as it was about 8 minutes ago.

    你看不到太陽現在的樣子,但你可以看到8分鐘前的樣子。

  • You can't see Alpha Centauri now, but you can see it 4.4 years ago.

    你現在看不到半人馬座阿爾法星,但你可以看到它4.4年前。

  • You see the Andromeda Galaxy as it was 2.5 million years in the past.

    你看到的仙女座星系是250萬年前的樣子。

  • And so on.

    等等。

  • With powerful telescopes, we can see galaxies whose light has been traveling to us for more

    通過強大的望遠鏡,我們可以看到星系,它們的光已經向我們傳播了更多的時間。

  • than 13 billion years.

    超過130億年。

  • We see them shining in a universe that's still young, where gravity has barely begun

    我們看到它們在一個還很年輕的宇宙中閃耀,那裡的引力才剛剛開始。

  • to pull matter together into stars and galaxies.

    將物質拉攏到恆星和星系中。

  • But we can see something even more distant, and more ancient, than the first galaxies.

    但我們可以看到比第一個星系更遙遠,更古老的東西。

  • If we peer out far enough, in between the galaxies, we can see parts of the Universe

    如果我們在星系之間足夠遠的地方觀察,我們可以看到宇宙的一部分

  • that are so far away, it has taken the light from that distance very nearly the entire

    在如此遙遠的地方,它已經採取了從該距離的光非常幾乎整個。

  • age of the cosmos to reach us.

    宇宙的年齡到達我們。

  • When we look at the most distant parts of the cosmos, in every direction, we see parts

    當我們看宇宙最遙遠的部分,在每一個方向,我們看到的是部分。

  • of the Universe that are so far in the past, they're still in the final stages of the

    的宇宙,它們還處於最後的階段。

  • Big Bang.

    大爆炸。

  • So far away, so far back, the space is completely filled with a dense, roiling plasma, the fire

    那麼遠的地方,那麼遠的後方,空間完全被濃郁的、漫天的等離子體所充斥,火

  • of creation.

    的創造。

  • We are not the center of the Universe.

    我們不是宇宙的中心。

  • But we are the center of our own perception as light reaches us from afar; we lie embedded

    但我們是我們自己感知的中心,因為光從遠處到達我們,我們躺在嵌入的

  • in nesting-doll layers of cosmic time.

    在宇宙時間的嵌套娃娃層中。

  • Each concentric sphere is an era.

    每一個同心球都是一個時代。

  • We can see the structure of matter changing, like geological strata all around us

    我們可以看到物質結構的變化,就像我們周圍的地質地層一樣。

  • The most distant layer of time that we can see is the light that has been traveling since

    我們所能看到的最遙遠的一層時間,是光自。

  • the moment the primordial fire began to cool.

    在原始之火開始冷卻的那一刻。

  • The cosmic microwave background surrounds us at every edge of our vision.

    宇宙微波背景環繞在我們視野的每一個邊緣。

  • We are embedded in shells of cosmic time, and the final one is fire.

    我們嵌在宇宙時間的殼裡,最後一個是火。

  • Thanks to Katie Mack, aka astrokatie, for collaborating with me on this twitter-thread-inspired

    感謝Katie Mack, aka astrokatie, 與我合作,在這個twitter線程的啟發下,為我提供了一個新的機會。

  • video poem.

    視頻詩。

  • Now, if you've ever wondered how we can know things like how far away distant stars

    如果你想知道我們是怎麼知道的 比如遙遠的恆星有多遠

  • and galaxies are, Brilliant.org, this video's sponsor, has an interactive course on just

    和星系是,Brilliant.org,這個視頻的贊助商,有一個互動課程,只是

  • that, exploring trigonometric parallax, standard candles, supernova, and more.

    那,探索三角視差、標準燭、超新星等。

  • Or if you want a small daily dose of science, Brilliant has a short problem of the day,

    或者如果你想每天來點小科普,《輝煌》也有今天的短題。

  • every day, that gives you just enough background information to figure out a math or science

    每天都會給你提供足夠的背景資料,讓你搞清楚一個數學或科學的問題。

  • puzzle; in fact, here's one about measuring the distance to the stars!

    謎題;其實,這裡有一個關於測量星空距離的謎題!

  • You can sign up for free at brilliant.org/minutephysics, and the first 200 people will also get 20%

    你可以在 brilliant.org/minutephysics 上免費註冊,前 200 人還將獲得 20% 的優惠。

  • off an annual premium subscription with full access to all of Brilliant's courses and

    折扣年費訂閱,可享受所有Brilliant的課程和。

  • puzzles.

    拼圖。

  • Again, that's brilliant.org/minutephysics.

    同樣,這就是輝煌.org/分鐘物理學。

Light travels at about 1 foot per nanosecond.

光的傳播速度大約是每納秒1英尺。

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B2 中高級 中文 宇宙 星系 遙遠 看到 謎題 恆星

宇宙時間的貝殼(ft. @AstroKatie) (Shells of Cosmic Time (ft. @AstroKatie))

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    Summer 發佈於 2021 年 03 月 21 日
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