The three principles of Special Relativity are:
1) length contraction
2) time dilation or time contraction / expansion with a constancy of 9 units.
3) failure of simultaneity at a distance or change in space over a distance.
Length contraction is essentially space expanding or contracting the faster it moves. Time dilation or time contraction / expansion is harder to grasp. Time always has 9 units in total. Each unit can expand or contract in size but when the resultant expanded or contracted units are counted they are always 9 in number which is equal to 1 unit of time. The failure of simultaneity at a distance is really the result of the expansion or contraction of individual units of space in time ( space-time ) whose total number must equal 9 of time before time can be seen / felt.
There also is the Law Of Conservation Of Momentum which states that linear momentum doesn’t change unless an external force acts upon it. The Law Of Conservation Of Energy states that energy can neither be created or destroyed.
Suppose we have a particle which is equal to 84. The string associated with particle 84 is obtained by adding its’ digits ( 8 + 4 = 12 ). The string associated with particle 84 can be also obtained by adding its’ first string number ( 12 ) to obtain 3 ( 1 + 2 = 3 ). Therefore particle 84 has the strings 12 and 3. If we subtract particle 84’s first string ( 12 ) from the value of the particle we get ( 84 - 12 = 72 ). If we subtract particle 84’s second string ( 3 ) from the value of the particle we get ( 84 - 3 = 81 ). 72 and 81 is the value of the frame in which the particle 84 exists at some location in two dimensional space. In one dimensional space 84 exists somewhere on its’ first one dimensional string 12 or somewhere on its’ second one dimensional string of 3. If we divide 84’s frames ( 72, 81 ) by 9 which represents 1 unit of time we get 8, or 9 units of space as in space / time. ( 72 / 9 = 8 ) ( 81 / 9 = 9 ). Depending on how you want to look at it, we have 9 units of space divided into a frame area of 72 or 81 ) giving us more space as an answer ( 8 or 9 ). Alternately you can look at it as one unit of time giving you 8 or 9 units of space as in time / space or space / time.
Length contraction involves the Law of Conservation of Energy and the Law of Conservation of Momentum. Suppose the universe is the size of the frame ( 72 or 81 ). The particle starts to move. Energy for that movement has to be taken from the particle because of the Law of Conservation Of Energy. That movement causes the particle ( 84 ) to contract to a lower number ( 69 ) and the resulting calculations change which is equivalent to a length contraction.
The Law Of Conservation Of Momentum says the total momentum can’t change in a closed system not affected by external forces. The particle 84 has a closed system ( frame ) of 81 or 72. If we observe the particle from outside the system that external ( observational ) force is acting to change the momentum of that particle. If we calculate the momentum from our position the answer will not match the observation of someone else from another position. That is why we cannot measure momentum and position of a particle at the same time because our act of observing changes the momentum and position of the particle. This is failure of simultaneity at a distance. It is also time dilation because the two observers are observing from different frames which have different space unit lengths totaling 9 ( equal to one unit of time ).
In summary, Time consists of 9 units of space before you have 1 countable unit of time. Each unit of these 9 units of space can expand or contract thereby giving Time the illusion of dilation. Failure of simultaneity at a distance is the result of the different frames from which the observation took place and the effects of the Law Of Conservation Of Momentum ( molecular vibration also ) on the relevant frame.