The first 500 people to sign up using the link in the description will get a 2-month free trial

前500個使用下方連結註冊的使用者即可獲得2個月的免費課程

Everybody watching this video lives on Earth, at least hopefully

現在每個正在觀看這部影片的人都住在地球上，希望是如此啦

Which means that you know the Earth

而我們都知道

Makes one complete rotation every 24 hours

地球每24小時完成一次自轉

The speed of this rotation is what defines a day

而自轉一次的速度我們定義為一天

But what would be some consequences if this speed doubled to once every 12 hours

但如果因為一些狀況發生導致自轉速度增加一天變成12小時

How would this affect our daily lives?

這會如何影響到我們的日常生活呢?

First it's important to understand that the Earth spins at different speeds

首先，我們必須知道地球的自轉速度並非是相同的

Depending on where you are standing

這要取決於你所在的地點

At the Equator, Earth spins at a speed of 1670 kilometers per hour

如果位於赤道，地球自轉的速度是每小時1670公里

The farther away you get from the Equator, the slower the spin you experience

越遠離赤道，速度越來越慢

So the Poles are where Earth spins the slowest

因此南北極地區是地球自轉速度最慢的地方

If Earth immediatedly began spinning twice as fast

如果地球突然間以兩倍的速度旋轉

The first thing you might notice is a little bit of weight loss

你首先會注意到的是體重些許的下降

Because the centripetal force of Earth's rotation is stronger at the Equator

因為自轉時的向心力在赤道地區較為強烈

Everything weighs slightly less here than at the Poles

東西在這裡的重量都會比在兩極地區所來的輕一些

Currently, if you weigh 45 kilograms at the North Pole

在正常自轉速度下，如果你在北極是45公斤的話

You would weigh 156 grams less at the Equator

你在赤道會比在北極少了約156克的體重

With Earth spinning twice as fast

而當地球旋轉速度來到兩倍時

A person that weighs 104 kilograms at the North Pole would weigh about half a kilogram less at the Equator

一個在北極體重104公斤的人在赤道地區將會減少將近半公斤的重量

Which is slightly more noticeable

這是我們可能稍微會去注意到的現象

But a much more obvious effect would be the lenght of our days at 12 hours instead of 24

但更明顯的現象則是一天從24小時變成了12小時

Days being half as long means that years will have twice as many days

一天少了近一半的時間意味著一年將會多出近兩倍的天數

730 days to be exact

準確來說，有730天

So we would need to create a new calendar pretty quick

這代表我們必須制定一套新的曆法規則

You'd have to adopt a new sleeping schedule in order to fit in your work and school during your daylight hours

你也必須採取一套新的睡眠時間表去符合你在白天的工作和活動

So instead of getting 8 hours of sleep per night

所以先前一晚大約可以睡8個小時

Most people would probably be getting 4 hours of sleep

現在大多數的人只能睡約4個小時

But sleep twice as often

且必須盡可能睡上兩次覺

If you're like me and stay up all night, well, good luck

如果你是像我一樣常常熬夜到很晚的。只能說，祝好運

Animals across the globe would also struggle to adapt their instincts

而在地球上的動物們也必須被迫改變原有的天性

Specially nocturnal animals that would have to hunt at night with half the time they are currently used to

尤其是夜行性動物，他們現在能夠在夜間獵捕的時間只剩下原來的一半

Animals that couldn't adapt would likely go extinct

而無法適應的動物將可能會走向滅絕

Also, hurricanes would be dramatically stronger

另外，颶風將會變得極度地猛烈

Winds at the Equator would be deflected further eastward

風在赤道會更偏向東方

And it would spin up hurricanes to faster speeds whenever they form

導致任何時候形成的颶風旋轉的速度會更加快速

But that's not even close to the worst thing that would happen to our planet

但這還不是我們目前遇到最糟的情況

The worst part about an Earth that spins twice as fast

地球自轉速度加快兩倍後最糟的事情

Would be the water in the oceans concentrating around the Equator

將是海水會不斷匯集於赤道地區

And receding from the Poles

導致兩極地區的海水退後

The higher centrifugal force would pull 100 meters or more

強大的離心力將會將100公尺以上的 海水

Of ocean water from the Poles here

從兩極的地方往赤道拉

And this would be wildly catastrophic

這幾乎可以說是毀滅性的災難了

Almost all of Equador, Colombia, Venezuela, Brasil

幾乎整個厄瓜多、哥倫比亞、委內瑞拉、巴西

Kenia, Indonesia, Malaysia, Singapore and Northern Australia

肯亞、印尼、馬來西亞、新加坡和北部地區的澳洲

would be totally underwater in this scenario

都會在這次事件中沉入海中

Forcing hundreds of millions of people to move either North or South

數以百萬計的居民將被迫向南或北邊遷移

Only the highest peaks like the Andes in South America

只有那些海拔高度夠高的山脈，如南美洲的安地斯山脈

Or mount Kilamanjaro in Africa would remain above the raising waves

或者非洲的吉力馬札羅山(Mount Kilimanjaro)仍會高於上升的海平面

Which would form new islands out of what used to be entire continents

新的島嶼將會形成在這被淹沒的大陸上

Africa would probably be split into 2 different land masses

非洲大陸可能會被分成兩個陸塊

With a few islands scattered between them

其中會有一些島嶼分散在兩塊大陸中間

While South America would just be greatly reduced in size

而南美洲的面積則會大大地縮減

One final reason that it would suck to be in the Equator during this scenario

而在這次災難中在赤道地區還有一個讓人覺得很糟的地方

Is that the less weight experienced would cause the air to be very heavy with moisture

就是更輕的重量會導致空氣中會有更多的水氣

The whole region would be shrouded in a very dense fog

整個赤道地區可能會被濃厚的霧給壟罩住

And would be subject to constant rain

且會持續不斷的暴雨

Combine this with a super powerful new hurricanes

再加上新形成的極度兇猛的超級颶風

And the Equator would be an extremely hazardous place

赤道地區將會是一個極端危險異常的區域

This means the Equator would be a significant geographical barrier

這代表赤道地區將會是一個很重要的地理屏障

Between the Northern hemisphere

它將會劃分整個北半球

And what remains of the Southern hemisphere

以及剩餘的南半球部分

One final consequence would be at least a momentary loss

最後一個結果則是我們將會馬上失去

Of satelite-based technology like GPS

藉由衛星為基準的技術如全球定位系統

Geostationary satelites orbit the Earth at a speed that matches the planet's rotation

地球同步衛星(Geostationary satelites)以與地球自轉速度相符的速度環繞地球

So that it can stay in place over the same spot on Earth's surface

因此它才可以在地球上空保持同一個點

If Earth's rotation speeds up then the satelites won't be in the correct positions anymore

若地球自轉速度增加，衛星就無法與地球同步在正確的位置

Which means everything from GPS, TV broadcasting

這意味著從全球定位系統到電視廣播

As well as military and intelligence communications could be disrupted

以及軍用和情報通訊系統皆會癱瘓無法運作

The speed of Earth in reality is constantly fluctuating

現實中地球的自轉速度一直是不斷在變化的

4.4 billion years ago, our planet spun at a rate of 4 hours per day

44億年前，自轉的速度是飛快的一天4個小時

And during the time of the Dinosaurs

而到了恐龍的時代(約2億3千萬年前)

It spun at 22 hours per day

一天是22個小時

Earth's rotation is actually slowing down every few million years

實際上地球的自轉是每隔幾百萬年都會變慢

Because of the gravitational Pole of our Moon

因為受月球引力作用的影響

And that slowing trend will continue on

而這變慢的趨勢會漸漸得影響地球

For billions of years to come

長達數十億年之久

Earth's rotation probably won't be getting any faster in the future

地球在我們的未來可能不會變得越來越快

Unless we get hit by something enormous that we don't see yet

除非我們撞到了我們無法預期的巨大的物體

But then at that point we'd have a bigger issue to worry about anyway

但到了那個時候我們可能會有更大的問題等著我們

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