Relativity — Tech Evolutions

Entry	Year	Description	Impact
N/A	1905	Special Theory of Relativity postulates: (1) The laws of physics are the same for all observers in uniform motion. (2) The speed of light in a vacuum is the same for all inertial observers, regardless of the motion of the light source.	Led to concepts of time dilation, length contraction, and mass-energy equivalence (E=mc²), fundamentally altering classical notions of absolute space and time.
N/A	1915	General Theory of Relativity postulates the Equivalence Principle: The effects of a uniform gravitational field are indistinguishable from the effects of a uniformly accelerated reference frame.	Redefined gravity as the curvature of space-time caused by mass and energy, leading to predictions of gravitational lensing, gravitational time dilation, black holes, and gravitational waves, replacing Newtonian gravity.