Space-time is one of the most important concepts in modern physics. It combines the three dimensions of space—length, width, and height—with time into a single, four-dimensional framework. This idea, introduced by Albert Einstein, allows scientists to understand how objects move, how gravity works, and how the universe is structured.

In space-time, the presence of mass and energy can warp or bend the fabric, affecting the motion of planets, stars, and even light. This bending explains phenomena such as the orbit of planets and the bending of light around massive objects, a phenomenon known as gravitational lensing. Essentially, space-time is the “stage” on which all events in the universe take place.

Understanding space-time is not just theoretical. Technologies like GPS satellites must account for the effects of both speed and gravity on time, which are predictions of space-time theory. Without considering space-time, modern navigation and many aspects of physics would not work accurately.

In short, space-time is the fabric of the universe, combining space and time into a single continuum. It shapes the motion of objects, the flow of time, and the structure of reality itself, making it a cornerstone of our understanding of physics.