Several billion years from now, there will be one last perfect day.

Then, over a period of millions of years, the Sun will swell, the Earth will heat, many lifeforms will be extinguished, and the shoreline will retreat.

The oceans will rapidly evaporate, and our atmosphere will escape to space.

As the Sun evolves into a red giant, the Earth will become dry, barren, and airless. Eventually, the Sun will fill most of the sky, and may engulf the Earth.