Name: 指南針在太空中能用嗎？| 米歇爾-塔勒 | 大思考 (Do compasses work in space? | Michelle Thaller | Big Think)
Uploaded: 2022-11-01T19:50:28.000Z
Duration: 3 min 17 s

- How do you find your direction in space

- 你如何在太空中找到自己的方向

where really there's no detectable magnetic field at all?

There's nothing to say this point is still

and this is the reference point we're gonna use

and everything moves according to that point.

We are actually falling gravitationally into the center

我們實際上是在重力作用下落入中心。

at about a million and a half miles an hour.

以大約每小時一百五十萬英里的速度。

And that's just when we say relative to what?

而這只是當我們說相對於什麼？

There is no absolute standard of reference in the universe.

宇宙中不存在絕對的參考標準。

and then maybe talk a bit more about the idea

of how we locate ourselves in space in general.

在一般情況下，我們如何在空間中定位自己。

A compass is something that responds to a magnetic field.

指南針是對磁場有反應的東西。

So the reason a compass always points north

是以，羅盤之所以總是指向北方

is that it's responding to the magnetic field of the earth.

是，它對地球的磁場做出了反應。

Our planet has this wonderful core of molten metal.

我們的星球有這個奇妙的熔融金屬核心。

and it generates a magnetic field that has two poles,

and it points to the magnetic pole of the earth,

Obviously, if you go away from the earth,

it's no longer gonna able to feel our magnetic field.

So a compass will not point to the North Pole of the earth

and they have magnetic fields of their own.

So certainly if you were actually close to Jupiter,

所以當然，如果你真的接近木星。

much stronger than the Earth's magnetic field,

What if you'd actually go farther from there?

如果你真的從那裡走得更遠呢？

Is there any magnetic field out in space itself?

Well, actually it turns out that there are,

好吧，事實上，事實證明，有的。

that our galaxy does have a magnetic field

This magnetic field might be hard to detect.

You might need a very, very sensitive compass,

你可能需要一個非常、非常敏感的指南針。

does have sort of a magnetic north and south pole,

and that magnetic field permeates our whole galaxy.

而這個磁場貫穿了我們整個銀河系。

So, with compasses, you could actually at least find out

是以，有了羅盤，你實際上至少可以發現

where the north and south pole of another planet is,

另一個星球的南北兩極在哪裡。

Even the north and south pole of a galaxy.

So, if you were trying to navigate with a compass in space,

所以，如果你想在太空中用指南針導航。

just remember that compass is going to respond

to the strongest and closest magnetic field.

Even to the north and south magnetic poles of our galaxy.

甚至到我們銀河系的南北磁極。

But what you're reading is a magnetic field.

And that's pretty much all I can tell you.

這就是我可以告訴你的幾乎所有情況。

with videos from the world's biggest thinkers.

伴隨著世界上最大的思想家的視頻。

And to learn even more from the world's biggest thinkers,

並從世界上最大的思想家那裡學到更多。

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指南針在太空中能用嗎？| 米歇爾-塔勒 | 大思考 (Do compasses work in space? | Michelle Thaller | Big Think)

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