Originally Posted by doodydota
Space is the absence of matter, like a shadow is the absence of light. Space is just a concept, a word in the dictionary - if you will. Like a shadow, space does not exist as a thing, and therefore space cannot have properties (like wrinkled nor curved). It's just common sense that has been muddied by high IQ autists with math and word-magic.
Except that physics begs to differ. Spacetime is a thing. It is curved by energy (of which matter is one form). The curvature of spacetime manifests as the gravitational field. Massive bodies are not attracted to each other; they follow straight paths through a spacetime that is curved. The apparent deviation from straight paths, ie acceleration near massive bodies, is actually just bodies following geodesic paths.
This is basically the content of Einsteinís General Theory of Relativity. Maybe GR is wrong. However it made some pretty unintuitive predictions, such as clocks at higher elevations run slower than clocks at lower elevations, light appears to be bent when passing near massive bodies, orbits around celestial bodies are not closed ellipses, but instead open curves that do not precisely retrace themselves, and trajectories of bodies through space near a rotating body will be different than predicted by classical mechanics. All of these predictions and more have actually been verified. In fact, there has never been a physical system found where GR gives a wrong prediction. Maybe there will be someday, but for now, there is very good evidence that spacetime is real and it has a curved geometry.