The theories of relativity by Albert Einstein revolutionized how the world thinks about space, time, mass, energy and gravity. Prior to Einstein, the laws of Isaac Newton were used to understand the physics of motion. In 1687, Newton wrote that gravity affects everything in the universe. The same force of gravity that pulled an apple down from a tree kept the Earth in motion around the sun.
In Einstein’s mathematics, space has three dimensions, and the fourth dimension is time. More recent theories presume extra dimensions that we do not perceive. This infographic, brought to you by Space.com, breaks down the 12 most important things to know about relativity.