The theory of relativity began as an idea of Galileo, a 17th-century astronomer, who wrote, "Motion exists relatively to things that lack it." This simple concept, when further explored by Albert Einstein, had astounding consequences.
Einstein's first step toward a comprehensive theory of relativity established that not only was motion relative, but time and space were as well. He would follow up this discovery with the world's most famous equation, E = mc2. Ten years later, Einstein would again turn the scientific world upside down when he proclaimed that gravity is not a force, but a curvature of space-time. With this declaration, he had rewritten the most fundamental law of science. In Theory of Relativity, discover why some believe that this theory is the greatest scientific discovery ever made.
Via 1001 Ebook