UNIVERSE OR UNIVERSES: If the moon revolves around the earth and the earth revolves around the sun and that in turn revolves around the centre of the Galaxy, then it seems feasible to contend that the centre of the Galaxy revolves around the centre of the Universe and that maybe even the centre of the Universe revolves around something greater than itself, and so on, in a process without end. The concept of multiple universes could then present itself to our comprehension as a continuous manifestation of greater and greater degrees of revolution around a central something which is always one step ahead, so to speak, of that which revolves around it.
However, the logic of this does entail a serious flaw. Why, you may wonder, doesn't something smaller than the moon revolve around the moon, and something smaller than the something which should therefore revolve around the moon revolve around it, and so on? Clearly, if there is a downwards limit as to what revolves around what, the moon having nothing revolving around it in the manner of planetary revolution around the sun, then it seems highly probable that there must also be an upwards limit which is established if not at that point where suns revolve around the centre of their particular galaxy, then almost certainly at that point where the centres of galaxies revolve around the centre of the Universe. If the Universe is still understood to imply the totality of existing galaxies, then the concept of multiple universes is still beyond our comprehension and possibly no more than a figment of the imagination.
But if multiple universes do exist, then the Western concept of a unitary universe is smashed to pieces, the totality of galaxies becoming merely a phenomenon appertaining to a tiny area of total space in which other universes - or immense galactic clusters - exist as logical entities at virtually incalculable distances from one another, and revolve in toto around a body or bodies greater than themselves.
Probably the concept of multiple universes derives, in any case, from a more evolved point-of-view which can accommodate the notion of alternative atomicities and thereby avoid being limited to just one monadic absolute such as would correspond, in theological terms, to the Father at the expense not only of the Son but of the Holy Spirit as well, and which would accordingly limit us to a force/mass autocracy in traditional subservience to a unitary cosmos.