Name: 為什麼太陽這麼亮，但宇宙卻是黑暗的？🌌 (Why Is Space Dark if the Sun Is So Bright? 🌌)
Uploaded: 2026-01-14T17:07:00.000Z
Duration: 1 min 48 s

程度副詞

Dear Blocko, why is space dark if the sun is so bright?

親愛的 Blocko，為什麼太陽這麼亮，但太空卻是黑的呢？

Yeah, if the sun shines at a whopping 3,860 trillion trillion watts, then why is space so dark?

對啊，如果太陽的亮度有驚人的 3.86 兆兆兆 watts，那為什麼太空這麼黑？

scientists estimate that the observable universe, just the part we can see, is 46 billion light years in every direction, creating a sphere with a volume of 410 nonillion cubic light years.

科學家估計，可見宇宙，也就是我們能看到的部分，在各個方向上都有 460 億 light years，形成一個體積高達 410 兆立方 light years 的球體。

And it's filled with roughly 200 sextillion giant balls, balls of hot gas, also known as stars, burning at temperatures reaching 60,000 kelvin, some with a brightness over 100,000 times the sun.

而且裡面充滿了大約 200 sextillion 個巨大的球體，這些是燃燒著高達 60,000 kelvin 溫度、發出比太陽亮 10 萬倍以上光芒的熱氣球，也就是恆星。

然而，我們周圍卻是一片黑暗。

It's the dust, dirt, water vapor, everything in the atmosphere that surrounds the Earth.

就是包圍著地球的塵埃、汙垢、水蒸氣，大氣中的一切。

You see, light travels in a straight line until it hits something like water vapor or dust.

你知道，光線會直線前進，直到碰到像水蒸氣或塵埃的東西。

This causes it to scatter into the different visible light colors we can see.

這會讓它散射成我們能看到的各種 visible light 顏色。

The reason why we see space, space as black is because in space, the light doesn't have a lot of cosmic dust to bounce off of, but

我們之所以看到太空是黑的，是因為在太空中，光線沒有太多宇宙塵埃可以反彈，但

So why don't we see at least some visible light in space?

那為什麼我們至少看不到一些 visible light 在太空裡呢？

The reason scientists think we don't is because the universe is expanding away from Earth, which means the light from other stars is also moving away from Earth.

科學家認為我們看不到的原因是，宇宙正在遠離地球膨脹，這意味著來自其他恆星的光線也正在遠離地球。

And when light moves away from something, its wavelength gets longer and longer until there is no visible light to be seen at all.

當光線遠離某樣東西時，它的 wavelength 會越來越長，直到完全看不到 visible light。

Click here to watch this video or here to watch this video YouTube thinks you'll like.

點這裡看這支影片，或是點這裡看 YouTube 推薦給你的影片。

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為什麼太陽這麼亮，但宇宙卻是黑暗的？🌌 (Why Is Space Dark if the Sun Is So Bright? 🌌)

literally

straight

whopping

atmosphere