Let’s start off with a commonly held, but unproven assumption or belief that extraterrestrials have in the past, and are currently, interacting with Planet Earth and humanity – ancient astronauts and UFOs respectively. Now since these aliens have neither invaded, nor sought diplomatic contact, they have been somewhat less than right royally in your face when it comes to making an absolute spectacle of themselves. Translated, they are here, but are somewhat shy, at least in the sense of staying out of harms way. Now where they would seclude themselves depends on a number of factors.

Firstly, if the aliens have indeed mounted a long-term expedition to our terrestrial neck of the cosmic woods, they will need access to resources. You can only bring so much with you and no recycling scheme is ever 100% efficient. Entropy rules: order to disorder; useful to useless. So, aliens will need to top up their energy tanks, their required minerals, water, fertilizers for their hydroponic tanks, etc. Fortunately for them, resources are abundant just about anywhere in our solar system – water (as ices), minerals, solar energy, hydrocarbons, etc. So, aliens don’t need to factor resources in their home away from home staying out of harms way equation.
» Read more: ET’s Home Sweet Home Away From Home