This is speculation that one possible fate of the universe is that the effects of dark energy will increase to the point where gravity and dark matter are no longer sufficient to hold large-scale objects (galaxies, galaxy clusters, and galaxy superclusters) together.
If you extrapolate from the currently observed acceleration to the expansion of the universe, one scenario is that it would continue apace and within a few billion years a Big Rip would begin to "shred" these larger structures.
If you Google "big rip galaxy" you will find several articles on this idea.