Relativity: Foundations, Principles, and Modern Applications
Abstract Relativity is one of the most significant achievements in modern physics, fundamentally transforming humanity's understanding of space, time, gravity, and the structure of the universe. Developed primarily by Albert Einstein in the early twentieth century, relativity consists of two major theories: Special Relativity (1905) and General Relativity (1915). Special Relativity describes the behavior of objects moving at constant velocities and establishes the constancy of the speed of light. General Relativity extends these concepts to accelerated motion and gravitation, portraying gravity as the curvature of spacetime. This article reviews the historical development, theoretical foundations, experimental confirmations, and contemporary applications of relativity in science and technology. Keywords Relativity, Special Relativity, General Relativity, Spacetime, Gravity, Einstein, Cosmology 1. Introduction Prior to the twentieth century, classical mechanics, formulat...
