Einstein's special theory of relativity put forward in 1905 holds that all inertial systems are equivalent, which breaks the absolute concept of time and space, and time and space are intertwined and related to the motion of objects. It is also pointed out that mass and energy can be transformed into E = MC 2, and the atomic bomb is made according to this theory.
19 15 years, Einstein put forward the general theory of relativity, holding that all inertial systems and non-inertial systems are equivalent. It believes that gravity can bend space, and it successfully explains the laws of celestial bodies, which is considered as a theory 50 years ahead of the times.
I wrote them all myself, which is not authoritative, but I think you can understand them. In fact, Baidu Encyclopedia has a detailed introduction. I'm interested in reading slowly:
/view/4243.htm