According to Einstein's theory of general relativity, space-time is curved by mass and energy. This means that the presence of matter and energy can cause space-time to be curved or bent, rather than being flat. The curvature of space-time affects the motion of objects, including the path of light, and is responsible for the force of gravity.
Space-time can be both flat or curved, depending on the presence of mass and energy. According to Einstein's theory of general relativity, the presence of mass and energy in the universe causes space-time to curve. This curvature is what we perceive as gravity. In regions of space where there is no significant mass or energy, space-time is considered to be approximately flat. However, in the presence of massive objects like stars or black holes, the curvature of space-time becomes more pronounced.
