Since galaxies can orbit each other, then separate bodies of mass relatively close to each other must form a collective center of gravity, or else one galaxy is orbiting a single mass in the other galaxy. If our sun is massive enough to bend light around it, then don't galaxies bend light around them? If so, is this accounted for when we measure the distance and location of distant galaxies? Would the bending of the light give us inaccurate readings of the amount of redshift, or would the effects be negligible? And when we view any distant point(s) of light, how can we know we're not looking at light which has been bent at a 45 or 90 degree angle from its source, due to its traveling near an intergalactic black hole?