In the Big Freeze scenario, continual expansion leaves the universe much too cold.

The Multiverse theory suggests that the universe is in fact made up of many universes and therefore may never completely end.

Consider the Big Bang & Steady State Theory that both may be right.
If the big bang was a Giant supernova one among many in the vast unseen by us so far and this particular one created our Universe.It will go on expanding until the Composts of the Universe we Choose to call Black holes will absorb and ultimately evaporate away releasig the very means of Restarting the whole Process again.
The Supernova Theory is based on the fact that no star/Sun has been discovered that does not contain trces of the heavy elements such as Iron produced only in Supernovas.
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Lets talk about Gravity i have long held the belief that gravity by whatever method it travels is finite.
That like a car driver driving with his handbrake on who releases is and accelerates away.The galaxys in the far reaches of our Universe are no Longer subjected to the pull of Gravity and they to accelerate away.
Until we find the answer what is Gravity how is it produced. We are at the Crossroads and await another Newton to guide us.

Yes the big freeze