The theory of special relativity is a recognized physical theory that has revolutionized advances in the relationship between space and time. The theory is one of the most interesting discoveries still used today in science fiction films such as Star Wars and Star Trek through the use of black holes and time travel due to its surprising results and the fact that it occurs at speeds close to that of light fast, which can attract a wide range of audiences. This was the harvest of six years of Albert Einstein's extremely manual labor. Einstein used resources that were widely available to the public due to his economic constraints. It wasn't until 1905, when Einstein finally finished and published his findings, along with compilations of other scientists' previous findings regarding the theory of special relativity. It was only in the 19th century that Albert's findings were incorporated into a reliable experiment by Maxwell, increasing the legitimacy of Einstein's findings. The theory of special relativity is still in use today in modern technological devices such as GPS, as well as in submicroscopic particle interactions, the movement of stars and galaxies, and cosmology. The first postulate of the relativity principle of the special theory of relativity known as the Galilean Principle of Relativity also states that no physical measurement can distinguish one inertial system from another, meaning that the laws of physics apply in all situations, in every time and in all places. The second postulate of the special theory of relativity states that the speed of light in vacuum is the same in all inertial systems, regardless of the motion of the source. This means that the speed of light is essentially the same in a vacuum under all conditions......center of the paper......mainly the decrease in length observed by a person from the stationary reference frame on the object which is in motion, and the greater the speed with respect to the observer, the shorter the observed length of the object.L = L0((1 - v2/c2))1/2where: L = the length measured by the "other " observerL0 = the length measured by observers on the reference system v = the speed of the object c = speed of light in vacuumL = 6.5 mv = 0.55cL0 = ?6.5 = L0×(1- 0.55c2/ c2)6.5 = L0×(0.45)L0 = 5.5/(0.45) = 12.2 mAs to conclude the Special The theory of relativity is one of the most important discoveries and can be considered the masterpiece of Einstein's work. Its principles are the basis of technological devices still used today, such as GPS. It has two basic principles that contribute to further conclusions regarding time dilation, length contraction, and mass increase.