We are 3 dimensional being. We are able to travel in 3 dimension. consider a spider. A spider is walking along the the wall. If we think of the floor as X axis and Wall as Y axis then its Y axis is changing but X axis is remainging the same.
Now consider the spider in the roof. Roof is also an X axis which is parallel to the floor. The spider climb in the roof from the wall and start to walk towards the light in the center of the room. At this moment X axis is changing Y is constant.
Now consider there is a spider web that start from the roof and comes down to the window in the wall. The spider see a mosquito stuck in the web. He start to approach the traped food crawling on his web. At this motion he is changing his X Axis and Y axis at the same time. Now all of a sudden he see a biger insect stuck in the left side of the web so he change direction and start to move towards the bigger insect. So now he is changing X Axis Y axis and Z axis which we call depth in easy term and 3rd dimension in physics term.
Another simpler example of 3 dimesion travel is airplane travel. Suppose Our X axis is a strait line between Maxico to Dhake. Y axis is a straight line between Maxico to canada and Z axis is a straight light from Maxico to sky upward.
Now consider you get into a plane in mexico city and plane start to fly towards England. Plane slowly gain hight that means Z axis (depth) is changing. it is moving from Maxico to east so it is changing X axis(length). At the same time it is going away from Y axis too. It is an example of 3 dimensional travel. As a 3 dimensional being we are capable of 3 dimensional travel.
Actually I wanted to explain time travel. Time is the 4 th dimension. This is the dimension we can realize but we cannot travel on it like we can in length width and hight. For Example consider the Mexico example again. If we start in the plane in mexico at 7 o clock AM in the morning and travel 8 hours to England. Your clock will show 3 PM. So you actually changed your X axis Y axis Z axis and forth dimension time Q axis. So does it mean we can travel in time dimension too? In theory using Physics the answer is Yes in a limited way. In Physics there is a notion called vector. I will explain don't worry.One vector is called one directional and the other one is called bidirectional.
Let me give an Example of one and bidirectional vector. Water dripping from the roof is a one directional vector because this water cannot climb back to the roof in the same path it came down.
Bi-directional vector is your Soda and straw. You can suck the soda from can to your mouth and send it back from your mouth to the can. Soda can travel in either direction
Then the question comes how the hell this vector direction related to time Travel?!* :duh:
Lets consider The mexico example again. you went to mexico from England in 8 hours. You started at 7 O clock AM and when you reached England your clock tells 3 PM.
Now lets advance the time, Suppose you take the flight right away back to Mexico. It will be another 8 hours your clock will be 11 PM upon arrival.According to physics if you go to England from mexico(0,0,0) and then come back to Mexico(0,0,0) from England then your distance you crossed in X, Y and Z direction is 0. That means you didn't travel at all. You are right were you started. But we cannot not tell it in aspect of time. This 16 hours you spend will never turn back to 0. In other words when you come back it will be mexico but it wouldn't be 7 O Clock AM. It will be 11 O Clock PM. That means we move forward in time which is comparable to the direction of water dripping from the roof. That water cannot climb back to the roof in the same direction. Same as our time getting forward but does not come back. :P
Now hypothetically if we would strat from Mexico at 7 O Clock AM go to england and come back to mexico at 7 O Clock AM at the same day that would make time change 0. Then we could say that we fulfilled the distance theory of physics and that would be time travel bidirectionaly.
You guys can kick me, agree with me or whatever just reply to it. Thank you!!!