When I look at pictures of swirling galaxies. The swirling patterns look very much like clouds swirling around the eye of a hurricane. This would imply that it is space itself that is being pulled toward the vortex of the galaxy and the stars are tagging along. Just like a hurricane pulls the clouds toward its vortex by pulling the air and a wirlpool pulls floating objects toward its vortex by pulling the water. I'm thinking that the black hole sucks in stars, and then spews out the dust at another point in space where another galaxy is formed. If another black hole is in its path, it could then become another swirling galaxy. I think that if the black hole at the center of a galaxy was just a source of gravity, the stars would follow a straight line toward it even if it was spinning. If it is space that is being pulled toward the black hole, wouldn't it mean that space has mass? Water must have mass in order for a whirlpool to exist, and air has mass in order for a tornado or hurricane to exist. If space can move, doesn't this imply that space has substance or mass?