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  • Black holes are among the most fascinating objects in our universe.


  • And also the most mysterious.


  • A black hole is a region in space where the force of gravity is so strong not even light, the fastest known entity in our universe, can escape.


  • The boundary of a black hole is called "the event horizon", a point of no return, beyond which we truly cannot see.


  • When something crosses the event horizon, it collapses into the black hole's singularity.


  • An infinitely small, infinitely dense point where space, time, and the laws of physics no longer apply.


  • Scientists have theorized several different types of black holes, with stellar and supermassive black holes being the most common.


  • Stellar black holes form when massive stars die and collapse.


  • They're roughly 10 to 20 times the mass of our sun and scattered throughout the universe.

    大概比太陽大 10 到 20 倍,散佈在整個宇宙。

  • There could be millions of these stellar black holes in the Milky Way alone.


  • Supermassive black holes are giants by comparison, measuring millions, even billions of times more massive than our sun.


  • Scientists can only guess how they form, but we do know they exist at the center of just about every large galaxy, including our own.


  • Sagittarius A, the supermassive black hole at the center of the Milky Way, has a mass of roughly four million suns, and has a diameter about the distance between the earth and our sun.

    人馬座 A 是銀河系中心的一個超大質量黑洞,大小約是太陽的四百萬倍,直徑是大概是地球到太陽的距離。

  • Because black holes are invisible, the only way for scientists to detect and study them is to observe their effect on nearby matter.


  • This includes accretion disks, a disk of particles that form when gases and dust fall toward a black hole, and quasars, jets of particles that blast out of supermassive black holes.


  • Black holes remained largely unknown until the 20th century.


  • In 1916, using Einstein's general theory of relativity, a German physicist named Karl Schwartzschild calculated that any mass could become a black hole if it were compressed tightly enough.

    1916 年時,一位德國物理學家卡爾·史瓦西使用愛因斯坦的廣義相對論,推算出任何質量只要被壓縮得夠緊,就可以變成黑洞。

  • But it wasn't until 1971 when theory became reality.

    但直到 1971 年,這個推論才變成事實。

  • Astronomers studying the constellation Cygnus discovered the first black hole.


  • An untold number of black holes are scattered throughout the universe, constantly warping space and time, altering entire galaxies, and endlessly inspiring both scientists' and our collective imagination.


Black holes are among the most fascinating objects in our universe.


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科學知識!帶你了解黑洞是什麼!(Black Holes 101 | National Geographic)

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    Elise Chuang 發佈於 2022 年 01 月 27 日