- 50,000 years: Because of tidal acceleration, the astronomical day will now be about 86,401 SI seconds. Under the present day timekeeping system, a leap second will need to be added to the clock every day.
- 14.4 billion years: Sun becomes a black dwarf as its luminosity falls below three trillionths its current level, while its temperature falls to 2239 K, making it invisible to human eyes.
- 100 billion years: The Universe's expansion causes all evidence of the Big Bang to disappear beyond the practical observational limit, rendering cosmology impossible.
идр. идр. идр.