In the context of spacetime, the term "space" refers to the three spatial dimensions (length, width, and height) that we are familiar with in our everyday experience. The addition of time as the fourth dimension gives rise to the concept of spacetime.
Spacetime is a mathematical model that combines the three dimensions of space with the dimension of time into a four-dimensional continuum. It is often represented graphically as a grid, where each point in the grid corresponds to an event in spacetime.
In this four-dimensional framework, objects and events are located not only in space but also in time. Spacetime provides a unified description of the geometry of the universe, allowing us to describe the motion of objects, the effects of gravity, and the propagation of light.
The curvature of spacetime, as described by general relativity, is influenced by the presence of mass and energy. Objects move along curved paths in spacetime, responding to the geometry of the surrounding spacetime curvature. The distribution of matter and energy determines the curvature, and the curvature, in turn, affects the motion of matter and the behavior of light.
In summary, the space of spacetime refers to the three-dimensional space as part of the four-dimensional spacetime framework, where both space and time are interconnected and influence each other.