Answer: Space time
Step-by-step explanation:
Space time is a model based on the concept that combines the dimension of time and space. The space time concept was discovered by Albert Einstein and it explains the unusual effect of relativism that happens when an object is traveling at a speed close to the speed of light, and also explains how huge object moves in the universe. It is a model that helps to describe how the universe works.
Note: The time dimension cannot be studied in isolation from the other three space dimensions.