I prefer a few scenarios over others. 1) they are peaceful and communicate with us that they are coming to drop in. 2) they are peaceful but cant communicate they are stopping by and we freak out but things work out in the end. these two instances work out peacefully.
instance 3) they aren't peaceful. they wipe us out with chemical or biological weapons before we even know they exist. 4) they stop in and give us the option of being slaves or dying either way they are taking our resources. 3 and 4 don't work out so well for us.
Two of these instances are more likely than the others and one is overall more likely. numbers one and three are the two most likely scenarios. If they are peaceful and advance they would surely have the good sense to send a messege before they arrived. if they wanted to wipe us out I'm sure they wouldn't bother doing it in person if they are so much more advanced. after all why bother making a mess and risking your people if you don't have to.
However scenario 1 is the most likely. if they are advance enough to cross lightyears of distance they obviously have technology that would allow them some luxuries EVEN WE already have imagined and actually layed they mathematical foundations for [we just don't have the tech to implement it yet](replicators and holodecks anyone?) and it is highly unlikely they would need our resources as it would be much more economical to harvest an uninhabited planet and then make whatever substances you need. and there are many more planets with more abundant/larger deposits of anything on our planet water and gold included. a species that advanced would also have plenty of genetics information and technology to make bioengineered slaves should they want or need them. there is no reason (scientific or otherwise) for a alien race to stop here except for peaceful communication.
the only questions left are "are we ready?" and "do they consider us worth the effort / worthy of their attention?"


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