I still hope for the day when someone will come up with a universe (model) where ordinary matter inside the Hubble sphere stays constant. My reading of the first paragraphs of this article went that way.

However, following the line upwards we learn that the entire observable universe – the area that sits within the “Hubble radius” is also on that line.

Unfortunately, baronic (energy//matter) is escaping from this Hubble sphere. At the present time we don't know (or don't have) a good mechanism to replace it. Even worse if the first law of thermodynamics applies then we won't find such a mechanism.

As the universe within the Hubble radius has grown in size, so has the total mass/energy thanks to increasing dark energy.

So, on the other hand, the increase of dark energy seems to violate this first law. I still hope.

[–] MuThyme@lemmy.world 5 points 2 years ago

If you're talking about what I think you are, then yeah I think that's just how it is. Eventually the only things we'll be able to see are the galaxies in our local super cluster (I think, this is technically outside my area) and eventually they'll all combine into a single extremely massive galaxy.

We live in a really unique time where we can detect that the universe is both infinite, and had a beginning. Hell, we live in the only time where we can know that this time is special.

The concept of a static universe died decades ago, so I don't think we'll be getting away from this. I don't really remember what time scale this is on, though if I had to guess it could be somewhere between 100's of billions to 10's of trillions of years.