There are 4 main dimensions.
Forward and Backward. Left and Right. Up and down and Time. These are the dimensions of 'Time and Space'. Because we are so used to the main 3 dimensions we find it hard to comprehend that time is also dimension which isn't fixed in a straight line, from start to finish.
The same as if there were a world where there were only the first 2 dimensions, if you placed a 3D object in there world they would be very confused by it.
Not many people realise it but the 'space age' made it possible to cross the fourth dimension there are allready time travellers amoung us. Such as Sergei Krikalev (picture below) who is the world record holder for space flight orbiting earth on the russian space station MIA for 803 days. This space station orbits the earth at 16,000 miles per hour. Having spent so long going so fast means he is also the world record holder for time travell. He has moved forward in time, only by a fraction of a second. But he is still technically a time traveller!
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