The Enlightenment was a political, philosophical, and scientific movement throughout Europe and the European colonies that became known as the Age of Reason. As communication systems advanced, the subjects of politics, philosophy, and science also expanded. The Scientific Revolution was a major part of the Enlightenment; people began to believe there was an order in the world that could be seen with rational reasoning. There were many important scientists and discoveries that shaped the growing world. Nicholas Copernicus’s heliocentric universe and Galileo Galilei’s theories on motion and inertia were two of the major innovations of the time. Sir Isaac Newton’s discovery of the role of gravity also played a major part in the Scientific Revolution.