He discovered what gravity is and came up with the three universal laws of motion. Isaac changed the way we thought the universe functioned. He invented the reflecting telescope.
The three laws of motion.
1. An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
2. Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
3. For every action there is an equal and opposite re-action.