In 1920 astronomers only saw stars and had no inkling that other galaxies existed. After the Andromeda galaxy runs into the Milky Way the universe will have accelerated away beyond the visible horizon to the point other galaxies will no longer be visible and we will only see the stars in our combined galaxy.

Just like a chapter of our universe's history being ripped out beyond the knowledge of whoever is still alive, we today may be in a similar situation in having a chapter ripped out of our universal history.
Especially if the age of the universe is much older than the currently accepted paradigm.