I wonder if you keep on learning or if there is only a certain amount each man can understand. (What the author purpose.) ( effect on the audience.)

ethos, logos, and pathos.

the future of her and bobby

martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.  

op: object of preposition