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The one that gets me: in the future, the expanded universe will be so spread out that there will be no detectable anything outside of your immediate solar neighborhood. No stars. No nothing. There will be no reason to assume the rest of the universe even exists. We live at an amazing time in our universe's history where we can see stars and learn from them.

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The expansion constant is weaker than gravity, such that gravitationally-bound structures, including everything from asteroids up through galactic clusters, will survive.

Beyond the local galactic cluster though -- quite possibly nothing.

> Beyond the local galactic cluster though -- quite possibly nothing.

Do you mean the Local Group?

https://en.wikipedia.org/wiki/Local_Group

Or the Local Supercluster?

https://en.wikipedia.org/wiki/Virgo_Supercluster

The Local Group is gravitationally bound, but that isn't the case with the local supercluster. I believe that most (all?) superclusters are not gravitationally bound.

In fact, the entire local group will eventually be a single galaxy I believe, mostly composed of the contents of the Milky Way and Andromeda galaxies.

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