However, if your science fiction story is good and interesting to enthusiasts of that genre, you may have a problem. Unless you are willing to, in effect, surrender your copyright rights in your work, think twice about putting it on the Internet. Consider, too, the nature of your work, especially fact-based works. This is the reason publishers of large annual reference works that list, for instance, names and addresses of executives of corporations in a certain industry or the names and addresses of all the franchise restaurant companies in the United States, can be found only in the reference section of your local library. If you are doubtful about just how protectable your work is, don't make it easier for an infringer to steal it.
Electronic rights are a new area of law that grows and changes weekly.
If you are offered any contract to put your work on the Internet, take it to a lawyer who is experienced in copyright law and get him or her to explain what you will be allowing by signing the agreement. The more important or potentially valuable your work, the more important it is that you look before you leap into an agreement that may give someone more rights in that work than you really want to give. It may also allow it to be published in a form that makes unauthorized copying too easy for potential infringers. Work with an experienced lawyer in your state.