Can you explain to me how time is regarded as the 4th dimension? Does it mean that if we assume time as a dimension then an object traveling to different time period is possible?
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For me it helps to observe the difference between a 2D and a 3D object. Carl Sagan has a great video he does with little pieces of paper.
He takes a few tiny pieces of paper and puts them on a table, the paper pieces represent 2D creatures, the table is their entire plane of existence. Then he picks up one of the pieces of paper. In the perspective of the other 2D creatures it has simply popped out of existence, but to us all that has happened is it rose up a few inches. Now Imagine if your computer were to suddenly move forward in time, same thing, it would seem to simply pop out of existence in the same manner.
A 2D creature cannot affect the 3rd dimension, but a 3D creature can affect the 2nd dimension. In the same way we cannot affect time, but time can affect us.
Now take one of the pieces of paper and slide it across the table, the 2D being has just moved through its 2D plane, while also moving through the 3D plane. In the same way, while we move through the 3D plane we also move through time.
Now if you can, try to Imagine a 4D being as one who is capable of moving through space and time as easily as you or I might walk across a room, and one who might observe us as little more than tiny pieces of paper sitting on a table.
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