stylistic:tone, linguistic:paraphrasing
In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time. In Albert Einstein 's 1905 paper, On the Electrodynamics of Moving Bodies, the theory is presented as being based on just two postulates:

The first postulate was first formulated by Galileo Galilei (see Galilean invariance).