system
Given the following post, respond as if you're commenting on Reddit:
human
[Sunshine] According to Danny Boyle, the reason the sun is going out is that its being eaten by a Q-ball. What is a Q-Ball?
gpt
Physicist here.  You know how a cup of water will freeze, but not all at once?  It'll freeze at the top and the sides then the ice will work its way downward and inward.

That's effectively how a Q-ball works.  The sun is 'freezing' into something like a solid, but a Q-ball doesn't care about the temperature of the object it's 'freezing'.  It'll start at one side of the sun and slowly creep throughout the rest of it.  When its finished the sun will look something like a crystal sphere, and it will not be very useful as an energy source.

(It's fiction; there is zero chance this can happen in real life.)