Why Time is not a 4th Dimension?
TIME is not real. It is man-made construct developed by us, The humans. It assists us in distinguishing between the present and past tense, according to an equally astonishing and perplexing notion.
Time is an illusion created by human memory; everything that has ever been and will ever be is happening right now. That is the theory of a group of eminent scientists aiming to unravel one of the universe's mysteries.
Most people don't think about time, yet there's nothing in the principles of physics that say it has to travel in the forward direction. We know about it through the assumption but not proven in empirical terms. The principles of physics are symmetric, which means that time could have easily flowed backward or forward.
They propose that there is a 'block universe in which time and space are combined, also known as space-time. Even if we consider in terms of Latitude and Longitude for relative time which is the by-product of distance itself. In laymans, we could say that Distance is the hardware while Time is software. Time has no physical value of existence.
What is 4-dimensional Figure?
Our brains are not built to think in more than three dimensions. Life on Earth only extends to the third dimension. The human mind cannot envision what it has never seen before. It would be like imagining a new colour in the cosmos that humans have not yet found.
What words would you use to describe it?
This mathematical and physical concept's inexplicability makes it an awfully real physics wonder. Many theoretical physicists, however, have suggested many hypotheses as to what the fourth dimension is and what it might look like. We can define this dimension scientifically, but we may never encounter it in physical reality.
Here are few 4-D figures:
A tesseract is a four-dimensional mathematical figure with equal-length lines that intersect at right angles. It is a four-dimensional extension of the square in the same manner that a cube is a three-dimensional extension of the idea of a two-dimensional square. Since we've added another dimension, four lines intersect at right angles at each vertex. In actuality, a tesseract has three-dimensional faces, each of which is a cube.
According to the hypothesis, which is supported by Albert Einstein's theory of relativity, space and time are components of a four-dimensional structure in which everything that has occurred has its coordinates in space-time. The theory itself gets flawed at the quantum level with ever expanding and unending universe. It is similar of expecting lemon from Mango trees which is not quite possible yet least we could say.
According to Max Tegmark, physicist of Massachusetts Institute of Technology - "We have the illusion, at any given moment, that the past already happened and the future doesn't yet exist, and that things are changing. But all I'm ever aware of is my brain state right now. The only reason I feel like I have a past is that my brain contains memories." Sounds Mind-boggling right?
Einstein, is not wrong but half-way right. Just like Rutherford while founding the atomic model through alpha-scattering experiment lays the pathway for modern atomic theory.
Dr Barbour a physicist researcher on space-time added- "The only evidence you have of last week is your memory. But memory comes from a stable structure of neurons in your brain now. The only evidence we have of the Earth's past is rocks and fossils. But these are just stable structures in the form of an arrangement of minerals we examine in the present. The point is, all we have are these records and you only have them in this Now."
Thus, man-made construct cannot have physical relevance which concludes to the fact that Time is not 4th Dimension because all the other three spatial has physical gradient and measurable as well.