Ok, we have all read that space is expanding, especially in low mass areas between galaxies, as described by GR. And that mass bends space, like seen in gravitational lensing. My question is whether on larger scales and masses, like on the size of galaxies, space itself is warped? The properties of space are warped to such an extent, that we perceive it as gravitational effects of missing dark matter. The flat rotational curves of galaxies are a direct result of the perceived gravitational well. There isn't a halo of dark matter, with a mass four to seven times the observed matter, composed of some unknown heavy WIMP particle, but rather the properties of space are warped on such large scales by mass. Even more so in galactic clusters.