Unlike most advances in physics, the theory of relativity was proposed based on mathematical theory rather than observation. The theory rests on two postulates that are difficult to test, and then derives mathematically what the physical consequences should be. Those two postulates are that the speed of light never changes, and that all laws of physics are the same in every (inertial) frame of reference no matter where it is or how fast it is traveling. This theory rejects Newton's view of gravitation and replaces it with a concept that there is a continuum of space and time, and that large masses (like the sun) bend space in a manner similar to a finger depressing an area of a balloon. From this proposed bending of space the expression arose that "space is curved." But experiments later proved that space is overall flat after all. | Unlike most advances in physics, the theory of relativity was proposed based on mathematical theory rather than observation. The theory rests on two postulates that are difficult to test, and then derives mathematically what the physical consequences should be. Those two postulates are that the speed of light never changes, and that all laws of physics are the same in every (inertial) frame of reference no matter where it is or how fast it is traveling. This theory rejects Newton's view of gravitation and replaces it with a concept that there is a continuum of space and time, and that large masses (like the sun) bend space in a manner similar to a finger depressing an area of a balloon. From this proposed bending of space the expression arose that "space is curved." But experiments later proved that space is overall flat after all. |