On The Potential Hostility of Alien Species

In this article we discuss the possibility that an extraterrestrial species could be hostile to humanity, and present estimates for the probability that visitors to the Earth will be aggressive. For this purpose we develop a generic model of multiple civilizations which are permitted to interact, and using randomized parameters we simulate thousands of potential worlds through several millenia of their development. By reviewing the species which survive the simulation, we can estimate the fraction of species which are hostile and the fraction which are supportive of other cultures.