Premise:
Things generate fields, magnetic and gravitational.
Disclaimer:
They may or may not be unifiable, and for my next argument, it is irrelevant.
Theory:
Both these fields fall with the square of the distance. That is, fast.

Question:
where is the end of the universe?
Many of us have been taught to believe that the universe does not have an end.
Some of us have been told that it is a senseless question.

Answer:
The universe does not end, it fades out.
It goes asymptotically to nothingness.
Devoid of influences.
To exist is to interact.

Conclusion:
The something that IS, ONLY IS when it influences - up close.