Antares 531 wrote:
This is a interesting perspective, but I wonder if maybe the universe
may eventually collapse back to the point of origin. If this could
happen, we might still see it expanding within our visible horizon but
it may be already collapsing out beyond our visible horizon. This
would be something like a geyser erupting. The water near the source
would be moving upward while the water on up near the top would be
slowing and eventually reversing, without any discernable effects on
the velocity near the source.

Gordon

I understand the point that you're trying to make, but it's not actually
the right analogy. Every particle in a geyser is actually slowing down
with gravity, the moment it leaves its source. So even though the liquid
is moving upward, it's constantly decelerating (negative acceleration),
it doesn't just suddenly slow down and start moving downward when it
gets to the top. The geyser is given one big acceleration upward by its
source, but from that point onward gravity takes over and decelerates it
constantly.

This is different from what we see with our Universe. We are seeing it
not actually accelerating rather than decelerating.

Yousuf Khan