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  • Hey there and welcome to Life Noggin.

  • Have you ever wondered why we don’t have time machines already?

  • Surely with all the technological wonder of today, someone would have figured out a way

  • for me to go back in time and ask my animator why he didn’t give me bigger muscles.

  • Is time travel even possible?

  • Let’s see if we can go back in time and convince everyone were all named Calvin

  • Klienwe just need to get a DeLorean first.

  • Can we time travel?

  • Sure, were always doing it!

  • I mean you travel in time whether youre just sitting there, walking the dog, or even

  • taking a well-deserved nap!

  • But I know, I know, that’s not what were really asking.

  • We want to know if we can travel in time faster or slower than we typically do, or if we could

  • potentially even travel /backwards/ in time.

  • The answer to at least part of that is a big olyes!

  • We can relatively change the speed at which we travel through time.

  • Popularized in 1905 by the great Albert Einstein, the theory of special relativity determined

  • that time does not pass at the same rate for everyone.

  • Through a phenomenon called time dilation, an observer moving relatively fast would measure

  • time passing more /slowly/ than a relatively stationary observer would.

  • This means that in a relative sense, time passes more slowly for Usain Bolt while he’s

  • running a race than when youre chilling at home, watching a brand new episode of Life

  • Noggin.

  • This is also why an astronaut sent into space would age slightly /slower/ than their twin

  • sister down on Earth.

  • It’s not just simply speed though; more gravity also makes time slow down as well.

  • This was determined from Einstein’s theory of general relativity when he realized that

  • massive objects cause a distortion in space-time.

  • Clocks closer to a massive object, like the Earth, would seem to tick more slowly than

  • clocks further away.

  • That’s why your feet are probably a super tiny bit younger than your head is.

  • That is, unless youre doing handstands all day.

  • Keep it up over there, Young Ears!

  • But what about traveling backwards in time?

  • While it might not be the best to completely rule it out as a possibility, quite a few

  • scientists believe that it could never really happen.

  • Stephen Hawking is one of the brilliant scientists that has thought we can’t travel back in

  • time and he threw an interesting party to give validity to that point.

  • He threw a big party, but only publicised it /after/ the party was over.

  • In theory, if people could travel back in time, then they could have heard about his

  • party in the future and traveled back to attend the experiment in time travelbut nobody

  • showed up.

  • While this obviously doesn’t prove that time travel to the past isn’t possible,

  • it was quite an interesting experiment.

  • I don’t know about you, but I would have traveled back in time if I could to hang out

  • with /the/ Stephen Hawking!

  • That said, there are some that believe time travel to the past might be possible utilizing

  • some super awesome things, like wormholes for instance!

  • Not to mention, there might be a way to travel back in time using certain laws of physics

  • or sciences that weve yet to find!

  • Maybe this weird thing holds the answer?

  • I still don’t know what it does!

  • So what do you think?

  • Is time travel to the past possible?

  • Let me know in the comments below!

  • Make sure you

  • come back every Monday for a brand new video.

  • As always, I’m Blocko and this has been Life Noggin.

  • Don’t forget to keep on thinking!

Hey there and welcome to Life Noggin.

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A2 初級 美國腔

為什麼時間機器還不存在? (Why Don't Time Machines Exist Already?)

  • 122 10
    吳晟光 發佈於 2021 年 01 月 14 日
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