ISAAC NEWTON (1642 - 1727) created theoretical physics. His law of gravity and laws of motion for the first time allowed a complete understanding of the empirical rules discovered by Kepler. |
ALBERT EINSTEIN (1879 - 1955) --- created a more general theory of gravitation, in 1915, which has been the basic description underlying all further progress in understanding the nature of the universe, since. [It is also the basis of the GPS navigational system.]