What advice would you give your younger self if you could travel back in time ???

What if the dimension of time was no different from the there dimension 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? What kind of time machine would you need to build?

Would you be able to change the past? and if you did would it create a time paradox?

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How many times have you wished you could jump in a time machine and skip that boring meeting or choose a better 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 constant, but it continually moving forward, and we  are moving forward with it. According to Einstein, time is the fourth dimension. Together with three-dimension space it's fused into a single four-dimensional continuum Spacetime . 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 stair. 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...because the secret to time  travel isn't in some exotic from 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 spaceship traveling at 99.9 % the speed of light to a potentially habitable exoplanet some 40 light-year 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 of 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 t you though, because traveling at the speed of light isn't quite possible with the technology we have now. The fastest piloted vehicle we're ever created Apollo 10 - reached the speed of 11,000 meters per second. the speed needed for time travel is somewhere near 299,000,000 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. 

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But hey, we still have wormholes. Einstein predicted that these theoretical tunnels link two separate spaces and two different times. A shortcut to another universe and another time. The problem with wormholes is they are extremely tiny just billion-trillion-trillionths 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 wormhole in the same place, but in different times, we could step into a wormhole and come out in a distant past.But wormhole 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 convince your grandmother never get married. Then your grandmother doesn't give birth to your dad,  and he didn't have you. But if yo didn't exist, who went back in time to talk your grandmother out of marring your grandfather? Time is linear-it only goes forward. For that reason, we can only travel into the future, not 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 future, they're proof that traveling in time is possible. And maybe, wormhole 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 to step into time machine not knowing where it would take you? And if you had choice, where would you go, and when ? comment bellow.