Speed of Light and Does Anyone Really Know What Time It Is

The speed of light is an expression based on the International standard for time and the result is about 300,000 kilometers per second.

E=MC² 

That's the original Big Bang Theory because it's Mass times the Speed of Light Squared or, loosely, 300,000 km/s with five more zeroes for an astonishingly large number.  That sum is the Energy of the Big, Big Bang of an atomic explosion.

Time is fundamental to the Physicist's Atheism because that view, generally, is Time began with the Big Bang for the Universe and, through complex gyrations in mathematics, Time loops back to itself so there is no actual beginning nor end.  That's an extremely loose view of it but that's not important because we will shred it anyway.

There are multiple research teams studying galactic motion in the Universe and have come to the conclusion of external influences on this Universe, presumably from other Universes.  This is not to say they are correct as we don't presume to have the qualification to make that judgment but we observe the hypothesis exists.

If other Universes exist then there's a bit of a cramp in the Physicist's Atheism because that makes Time continuous even if not all Universes are there to present it any given moment.  For example, Universe A begins, grows, and blows up.  Somewhere during that evolution, Universe B got into it and, relative to A, it starts later and blows up later.

If there are C, D, ... Z Universes, that presents a continuum rather than a self-contained, localized thing with any given Universe.

It seems the only other option is for the speed of light to vary from one Universe to the other and good science demands that consideration ... except it makes most of Physics fall apart.

So, what will you do, Grand Philosophical Wizard of the Ages.

Perhaps you postulate the good Lord creating Universes much like throwing another shrimp on the barbie or everything is predictable with a reasonably good knowledge of statistics and probability.

Of one thing we're sure, if you come away from the idea with a question then most likely you're on the best track because the revelation of ignorance is always the best outcome of knowledge.

Above all, we don't rule out anything.  Maybe we could believe this Universe 'just happened' and that's the way of it.  Perhaps but the existence of multiple Universes doesn't seem to serve that idea well unless there's some causal relationship between the Universes.  We suspect but do not know whether any idea of a causal relationship would stretch the mathematics beyond all reason.

So, what will you do, Grand Philosophical Wizard?

Note:  we don't expect an answer because we can get lectures on a social network but we are much more interested in questions.