system
Given the following post, respond as if you're commenting on Reddit:
human
When the sun eventually expands and consumer Earth, will it expand all at once in the blink of an eye or be a gradual expansion over a long period of time?



How embarrassing... Typo in my title. 

I don't know how many billion years from now, but at some point in the future the sun expands. 

Will this be a slow process where the sun grows larger over a period of.... Some amount of time. 

Or will it be more a 'boom' and in the blink of an eye puff up to a larger size?
gpt
Gradual process. Has to do with the expenditure of its fuel causing it to progressively expand until it collapses under its own weight. We happen to live within its potential expansion area, but the radiation, heat, and solar flares will bake the planet dry ( literally) well before we fall into its surface. 

We will be well dead before it swallows us up.