What Does Gravity Have To Do WithThe Expanding Universe?

[Anomalocaris]

Why do you think that's a rule?

Interesting question.

In fact, the universe is the ONLY thing that's expending. Electrons aren't moving away from their respective nucleons. planets aren't moving away from their respective suns. Stars within a galaxy aren't moving away from each other. Only galaxies are moving away from one another,      e r go, the raisin bread dough model.

so, yes, it's possible for dark energy to be the only thing that has no counter, not as a rule, but just the way things are.

In time we may move so far from other galaxies that we think we're the only one. Or we may move into the viciiity of another universe and not realize it's another. How will astrologers explain the weird constellations?

I don’t believe what you say is quite true.   Expansion of the universe and the impact of the Dark energy of the universe affect all things, including stars in galaxies and electrons in atoms.  Right now at the distance scale seen between stars in a galaxy, or anything smaller, the strength of gravity or other fundamental forced overwhelms the pressure of dark energy.  So ignoring the pressure of dark energy and it’s effects on the expansion of space between stars gives an accurate enough approximation.

As to what astrologers will think when expansion of the universe moves all other galaxy beyond our observation horizon, well. First of all, all the constellation are made up of stars inside Milky Way, and indeed all but a very small handful of objects visible to the naked eye are Located in parts of the Milky Way very close to us, say 3000 light years inside a galaxy 100,000 lightyears across. So moving other galaxies beyond our observation horizon will have little noticeable impact on the sky visible to naked eye astrologers.


But. In the amount of time it would take for expansion of the universe to move all other galaxies beyond our visible horizon, all the stars in the currently in the Milky Way, and all the stars that would ever form normally from material available would have long since expended all their fuels, died, and their corpses cooled until their surface temperatures are close to the cosmic background. The same would apply to all other galaxies.

So. By the time all other galaxies recedes from our visible horizon, carried by the expansion of the universe, our galaxy would be almost totally dark, with no luminous stars. There would only be some extremely faint radio wavelength glows from cooling star cinders and Hawkins radiation from black holes, punctuated at extremely long intervals by brilliant flashes signifying collisions between stellar corpses, or hawkin evaporation of blackholes. No biological eye known to us would be sensitive enough to pick up the faint stead glow from the dead galaxy as we would have by then, much less see constellations.