Editing Post-Apocalyptic (section)

====Planet killers====
Humanity may survive on another world in the Solar System and/or beyond, but Earth is gone - either wiped sterile or no longer on the map at all.
*Gamma-Ray Bursts (GRBs) - basically, if a big star that's close enough dies when its magnetic poles are facing us, the resulting jet of radiation will destroy the Earth's ozone layer, making the Sun [[Meme|a deadly lazer]] once more. While it's possible to survive, given that one major extinction in Earth's past might have been caused by a weaker one, it's more likely to cook everything alive - either directly or indirectly depending on the distance.
*Solar luminosity - due to the way stars function, they get brighter and hotter as they get older. The Sun is no exception, and this is not a good thing. Eventually, in about 1 billion years or so, the Sun will be outputting too much energy for life on Earth to be viable anymore. While inevitable, we (or whatever comes after us) has a LONG time to prepare for the Great Exodus.
*Planetary collision - While ''extremely'' unlikely in the current state of the Solar System, it's still a possibility, and one scary enough for conspiracy theorists to fearmonger using. Any rocky body large enough for gravity to make spherical - be it a very large asteroid or comet, a moon, or another planet - ''will'' revert the Earth to a state similar to how it was when it formed if it smacks into it, or outright destroy it if massive enough. Usually the other planet won't fare much better, unless it's a gas giant that eats rocky planets for breakfast. The suspect to watch out for is rogue planets, though given enough time Mercury might become suicidal.
*Eaten by the Sun - either due to some freak gravitational disturbance or the Sun inevitably becoming a red giant (see 'death of the Sun'), there's a chance that the Sun will do what the Tyranids can't due to plot reasons and eat the Earth, melting it into a glob of plasma. It's iffy in the latter case since the Sun maxes out in size around the time it would eat Earth, becoming too big to hold onto all its gas. Not that it matters, as solar luminosity would have made it an unimportant magma ball by that time anyway.
*Yeeted into space - Gravitational disturbances - whether one big one or a series of smaller ones - could fling Earth out of its orbit and into interstellar space, likely killing all life since the big light in the sky is gone.
*Eaten by a black hole - if a black hole is big enough to start chowing down before it blows up due to Hawking radiation, but small enough not to throw a star system's gravity out of whack, it can easily replace the Earth with a black sphere of inescapable gravity.