Martian Literature

I found this interesting article about why we refer to "humans" and life on Mars as Martians while we do not do the same for Saturn (Saturnians). The obvious answer for this class would be "well duh, Saturn and Venus don't have atmospheres, they can't support life." You know, all the important stuff Bernie has taught us. But what about the people who don't know these things? Why does Mars provide such a great breeding ground for fiction? I like the quick over views of each novel or series and might even read some of them (if I ever get out of school and finally read for fun again).