DIMENSIONS OF THE UNIVERSE

GENERAL RELATIVITY AND QUANTUM MECHANICS

According to String's Theory there are 10 or 11 dimensions in the universe. As we know the three dimensions are Length, Breadth and Height. The fourth dimension is time. We are not able to observe the other dimensions because either we are very small or not so large to be able to detect the extra dimensions. There are two theory proposed regarding this. The first is to compactify the extra dimensions; i.e., the 6 or 7 extra dimensions are so small as to be undetectable by present day experiments. And the other is Bran-World Scenario we are "stuck" in a 3+1 dimensional (i.e. three spatial dimensions plus the time dimension) subspace of the full universe.

GRAVITY
Dimensions are something which binds this universe. Gravity binds this universe, so it can be one of the dimensions of the universe. Gravity is the Fifth dimension of this Universe.