[Sa'ar Chasm]

I thought that Sol was too small to outright explode. I thought it was just going to fizzle out into a brown dwarf.

It will swell up into a red giant once it exhausts its hydrogen fuel, and then it will fade to a white dwarf after it exhausts its helium fuel. It's not massive enough to undergo any other type of fusion. Brown dwarfs are stars without enough mass to start hydrogen fusion.