Time is related to the expansion of space. Slower time is associated with slower expansion and negative curvature in space in a higher dimension which was first described by Einstein. This extra dimension is not a time dimension in which we can travel. Time is just the presence of motion and forces and is caused by the expansion of space. When we discuss time we will come across terms like curvature in space in a higher dimension, expansion of space, slowing of time in gravity and slowing of time in motion. It is important to understand the connection of each one of presence of motion and forces to matter in an area of space. Also slower expansion of space produces negative curvature in space. Although time is slower in negatively curved space it is the slower expansion which is causing slower time and not the negative curvature. Slower expansion is in turn due to presence of a mass. The gravitons radiate from a mass under the influence of expanding space. Gravitons are thought to be double spin particles that interact with space to slow the expansion. All these phenomenon expansion of space, curvature in space gravity and time are interconnected. Prime mover however is the expansion of the space and the universe.