Island universes after acceleration

As dark energy drives accelerated expansion, distant galaxies will recede beyond our cosmic horizon so future observers will live in an isolated 'island' containing only the Milky Way's remnants and its satellites. Over vast timescales (billions to trillions of years) starlight will dim, star formation will cease, and the Universe will approach heat death, changing what can be observed or preserved. — This reframes debates about long‑term space policy, archival priorities, and existential meaning by showing the physical limits on any civilization's long‑term audience and resources.