Editing Post-Apocalyptic (section)

====Star system killers====
For these, humanity has to have gone interstellar if it has any hope of not going extinct.
*Death of the Sun - Sun runs out of fuel and turns into a sad white ball unable to warm up anything, possibly eating the Earth in the process. Enough said.
*Supernova - Sure, the system it's in is going to be feeling most of the pain, but a close enough supernova doesn't even need to have its GRBs aimed at you to kill - the weaker radiation in all directions can do that too. Granted, it has to be VERY close for that to even be a threat, though candidates for such an event exist. You have even shittier luck if you're caught in a hypernova, which spreads radiation a fair bit farther. 
:*Gamma Ray Burst [[Meme|2: Electric Boogaloo]] - Speaking of GRBs, at certain distances one could wash over the entire solar system but still be lethal. More likely than a direct hit as described in the Planet Killer section, too, though technically weaker since they're less focused at the required distances. 
*Stellar collision - basically the only way the Sun can go boom like a supernova. White dwarf, main sequence, whatever - if it's big enough, a game of galaxy billiards can go horribly wrong. The chance it does is extremely low due to the distances involved, but it does happen - especially in denser regions of space.
*Black hole buffet - Large enough black hole to disrupt orbits? The entire system is either becoming a snack or getting torn apart, with nothing in between.