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 What If Time Travel Was Possible?
작성자
 이** (jean)
글내용

 

Description: 

What if the dimension of time was no different from the three dimensions 

of space we live in? What if you could travel to the past and to the future….

the same way you can move right or left, up or down? Would you be able to 

change your past? And if you did, would it create a time paradox? 

What kind of time machine would you need to build, anyway?

 

Transcription:

What if the dimension of time was no different from the three dimensions of space

we live in? What if you could travel to the past and to the future, the same way 

you can move right or left up or down? Would you be able to change the past? 

And if you did would it create a time paradox? 

What kind of time machine would you need to build anyway? 

This is what if and here's what would happen if you could travel through time?

How many times have you wished you could jump in time machine and skip

that boring meeting. Or choose a bitter comeback in that argument last week? 

Time travel sounds like some wild fantasy that only happens in sci-fi movies.

But we're actually traveling in time every day. Albert Einstein found that,

time is not a constant but it's continually moving forward and we're moving 

forward with it. According to Einstein, time is the fourth dimension. 

Together with three-dimensional space it's fused into a single 

four-dimensional continuum,space-time. If you think of traveling in space 

moving upwards is a bit of a challenge unless we get on a plane or at

least take the stairs, so maybe we just haven't come up with a proper

machine to travel in time yet.Theoretically, building a time machine is possible.

but it wouldn't look like this or like this rather more like this because the 

secret to time travel isn't in some exotic form of matter. What you'd need

is a spaceship that could travel almost as fast as light. Einstein's theory 

of relativity taught us that the faster we move through space the slower 

we move in time. Let's assume you were in a spaceship

traveling at 99.9 percent the speed of light to a potentially habitable exoplanet 

some 40 light years away. You find some primitive life-forms and speed back

to earth to share your discovery. But when you finally make it back to earth,

you discover that all your colleagues are now very very old. 

From your perspective you'd only been gone for about two years 

for people on earth you'd been gone for 80. This phenomenon is known 

as time dilation it's not likely to happen to you though because traveling 

at the speed of light isn't quite possible with the technology we have now. 

The fastest piloted vehicle we've ever created 

Apollo 10 reached a speed of 11,000 meters per second. The speed needed 

for time travel is somewhere near 299 million meters per second. On top of that,

accelerating at that speed would cause an enormous centrifugal force. A force 

that would rip you apart before you came anywhere close to light speed.

But hey, we still have wormholes. Einstein predicted that these theoretical 

tunnels linked two separate places and two different times, a shortcut to another

universe and another time. 

The problem with wormholes is they're extremely tiny

just a billion trillion trillionth of a centimeter across. No human would be able to 

fit through I can barely fit in my jeans from last year. 

If only we could capture a wormhole we might be able to enlarge it.

Imagine, a giant tunnel above the earth leading to another planet and 

theoretically if we put both ends of a wormhole in the same place but 

in different times, we could step into a wormhole and come out in

the distant past.But wormholes have their issues,they're very 

short-lived and traveling into the past would create paradoxes. 

Like the one in which you go back in time and convinced your grandmother 

never to get married, then your grandmother doesn't give birth to your dad 

he doesn't have you. But if you didn't exist who went back in time to talk

your grandmother out of marrying your grandfather. Time is linear. 

It only goes forward for that reason we can only travel into the future not 

to the past. In fact, astronauts that spent about a year on the

International Space Station are now living in the future compared to us. 

Even though it's just 13 milliseconds in the future they're proof that 

traveling a time is possible. And maybe wormholes could open up a 

whole different world where the laws of physics work in different ways 

and traveling to the past is possible.

Would you dare step into a time machine not knowing where it would take you?

And if you had the choice where would you go and when?

 

Questions:

1. Explain why we can’t travel back in the past based on Albert Einstein's 

    Theory of relativity. 

2. What is time dilation phenomenon?

3. If you could travel in the past, which time would you like to be in? Why?

작성일자
2020-09-03 오후 2:27:24
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