Editing Post-Apocalyptic (section)

=== Alien Invasion ===
[[File:The War of the Worlds by Henrique Alvim Corrêa 15.jpg|right|250px]]
There are at least a hundred billion stars in the Milky Way galaxy and two hundred billion galaxies in the observable universe. The Raw Materials of life as we know it are common and life got started fairly early in earth's geological history. It's a safe bet that on some distant planet life emerged and would evolve, possibly into other beings at least as smart as us and possibly with a head start of thousands to millions of years. Similarly from the physics we know, movement from star system to star system is definitely possible if you have the patience. We can only hope that such civilizations are nice guys, because if not we are in trouble. Because if said aliens have the technology to reach us from their side of the galaxy before we do, they very likely have technology that can send us back into the Stone Age as well.

Over the years, there has been a lot of different takes on alien invasions. Tripedal fighting machines to flying saucers, subtle infiltration, creatures which hijack our bodies/replace us with duplicates, hordes of bugs, fleets in orbit, legions of alien soldiers, self replicating robots and more. The consequences there-of also vary. Some aliens might try to strip mine the earth, others might enslave humanity, put mankind into reserves, assimilate us or turn earth into a nature preserve. Or if you're really creative, the Aliens could have much more esoteric motives, ranging from wishing to have diplomatic relations with cows, to turning humans into drugs. Or maybe the Aliens are just so beyond our experience that their motives are incomprehensible to us. You can do a lot with alien invasions and the aftermath there-of.
====Examples====
* The War of the Worlds 
* Resistance
* Muv Luv, especially the spin-off 'The Day After'
* Independence Day