Is Space-time flat because of the presence of mass or Space-time is inherently curved?

Answer 1

Space-time is inherently curved. The presence of mass and energy in space-time causes curvature, as described by Einstein's theory of general relativity. Mass and energy curve the fabric of space-time itself, leading to what we perceive as the force of gravity. Therefore, space-time is not flat inherently and can be influenced by the presence of mass or energy.