How did albert Einstein change the 20 th century in science?

Answer:

Before Einstein there was Newtonian physics which did not consider the speed of light and its effect on a body in motion and Einstein with his theory of relativity defined the effect of speed of a body on its weight and dimensions which brought drastic changes in atomic and quantum physics.

First answer by ID3497568151. Last edit by Anudeep.vlsi. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 1 [recommend question].