Welcome to Life Noggin.

歡迎來到 Life Noggin。

We live in a part of the solar system called the Goldilocks zone, where it's not too hot that all the water evaporates away, but it's also not too cold where it freezes instead.

我們生活在太陽系的一個被稱為「適居帶」（Goldilocks zone）的區域，在這裡，氣溫不會太高以至於所有的水都蒸發，也不會太低以至於水都凍結。

And unless you're an astronaut, the big spherical rock will be your home for life.

除非你是一名太空人，否則這個大的球形岩石將是你一生的家。

But what if that home suddenly changed?

但如果這個家突然改變了呢？

What if in a split second the earth doubled in size?

如果在一瞬間，地球的大小增加了一倍，會怎麼樣？

Let's assume that the density remains constant.

讓我們假設密度保持不變。

So the mass of the earth increased as well.

所以地球的質量也增加了。

How would that change things?

這將如何改變一切？

Well, first off, gravity would be very different.

嗯，首先重力會非常不同。

The earth would have eight times as much mass and gravity would be twice as strong.

地球將有八倍的品質，重力將是兩倍的強度。

So if you stepped on a scale you'd suddenly weigh twice as much as before, it would be much harder for you to walk and you get tired much more easily.

如果你踩在秤上，你會突然比以前重一倍，你會更難走路，而且更容易疲勞。

After all, you'd feel like you were giving another version of yourself a piggyback ride all day every day, which would look very funny.

畢竟，你會覺得自己每天都在背著另一個版本的自己，這樣看起來會非常滑稽。

Over the years, human bones, especially in the legs, would have to become stronger to support this increased weight.

人類的骨骼，特別是腿部的骨骼，將不得不變得更加強大，以支持這一增加的重量。

Meanwhile, trees would start to collapse and any new trees that grow in their place might not grow as tall.

同時，樹木會開始倒塌，任何在其位置上生長的新樹可能不會長得那麼高。

See, there's a limit for how tall a tree can grow, usually around 400 ft or so.

看，一棵樹能長多高是有限制的，通常在 400 英尺左右。

This limit is determined by gravity since the taller the tree is, the more energy is required to transport water from the roots to the top.

這個限制是由重力決定的，因為樹越高，將水從根部輸送到頂部所需的能量就越大。

If the amount of energy the tree gains from photosynthesis is more than the energy it takes to transport the water, it'll keep growing; otherwise, it'll stop.

如果樹木從光合作用中獲得的能量多於運輸水的能量，它就會繼續生長，否則就會停止。

So if the earth suddenly got twice as big, trees like the California redwood may not be as impressive.

所以如果地球突然變得兩倍大，像加州紅杉這樣的樹木可能就不會那麼令人印象深刻。

Luckily, even though the gravitational pull of the earth will be stronger, it still won't be enough to break the moon apart.

幸運的是，即使地球的引力會更強，但仍不足以使月球碎裂。

See, in order for that to happen, the moon would have to be within the Earth's Roche limit.

為了實現這一目標，月球必須在地球的羅氏極限內。

This is the minimum distance the moon can approach the earth without being torn apart by tidal forces.

這是月球接近地球而不被潮汐力撕碎的最小距離。

This happens because the near side of the moon is pulled in harder than the far side.

發生這種情況是因為月球的近側比遠側被用力拉入。

When the moon gets close enough to the earth, the gravity holding it together is overcome by this cosmic tug.

當月球離地球足夠近的時候，支撐它的重力就會被這個宇宙的拉扯力所克服。

Inside that limit Earth's gravity will tear the moon apart, giving us a ring like those around Saturn.

在這個限制下，地球的重力會把月球撕裂，給我們一個像土星周圍的環，

Oh, and the more earth there is, the more it will heat up.

而地球越多，它就會越熱起來。

See, if there are more unstable elements in the crust and interior, more heat will reach the surface and there may be much more volcanic activity.

如果地殼和內部有更多不穩定的元素，更多的熱量將到達地表，可能會有更多的火山活動。

And I don't know about you, but I'd rather not live in a world where there's a constant threat of an exploding volcano.

我不知道你怎麼想，但我寧願不生活在一個不斷有火山爆炸威脅的世界裡。

Oh wait, are we already living in that?

哦，等等，我們已經生活在那個時代了嗎？

I'm looking at you, Yellowstone.

我在看著你，黃石公園。

Anyway, if you could live anywhere in the universe, no limitations, where would it be and why?

反正，如果你能生活在宇宙的任何地方且沒有限制，會在哪裡呢？

If I could, I'd totally live in Jupiter's great red spot.

如果我可以的話，我完全可以住在木星的大紅斑裡。

It'd be pretty dangerous, but I'm an animation.

這將是相當危險的，但我是動畫人物。

I can totally handle it.

我完全可以應付。

Make sure you come back every monday for a brand new video.

請確保你每週一回來看一個全新的影片。

As always, I'm Blocko.

一如既往，我是 Blocko。

Oh, this has been Life Noggin.

哦，這裡是 Life Noggin。

Don't forget to keep on thinking.

不要忘記繼續思考。