stevehw33 - As my thread on universal spin was locked and the moderators have requested I post on that theme in this thread, I wish to zero in on universal spin on this thread. <br /><br />Please see the Suggestion's thread to see how this situation has evolved (or was created).<br /><br />On thread theme, though, you can have a center of gravity that is not at the center of mass.<br /><br />For example, see Leovinus' past responses on plural <br />Great Attractors which postulates that the center of gravity of the Great Attractor does not have any mass in that precise location as the attraction is coming from multiple sources which combine to appear to come from that location.<br /><br />I do not accept Leovinus' referenced model - though I consider it tenable.<br /><br />I still consider the old model of one Great Attractor at the center of gravity.<br /><br />But I do have an open mind on this, and also on thread theme, and also on universal spin.<br /><br />Note I consider that the center of expansion is not the center of our universe, and that our universe probably only has a 4-d center (including time, hence space-time, e.g.: an origin at a singularity.)<br /><br />There, however, may be a center of expansion different from said singularity.<br /><br />Or, if universal spin is one of the causal mechanisms then indeed there could be the same 4-d center (note segway to universal spin models).<br /><br />However, some models of expansion have more than one cause at more than one time - thus there would be more than one center of expansion - depending on how expansion is propagated.<br /><br />For example, consider dark energy rather than universal spin as the cause for acceleration of expansion.<br /><br />And consider still another cause for the past inflationary epoch - as some scientists have modeled still different causes for this effect.<br /><br />The center of propagation would be the center of the above cause and effect mechanisms.<br /><br />"Center," in some of those cases, is not