Sorry to be pedantic, but I have to take exception to the line:
"when Einstein disproved Newton's theory of gravity"
This is at best a misrepresentation of the nature of science, and at worst a total misunderstanding. Einstein absolutely did not disprove Newton - his Relativity superseded Newton's Laws of Gravitation, but at the same time encompassed them as a special case of Relativity (when Relativity is simplified by reducing velocities to "everyday" speeds, i.e. tiny fraction of fraction of the speed of light).