SF is a difficult and transient literature at the best of times, ultimately problematic. It claims to treat of the future, all the what-ifs and if-this-goes-ons; but the what-ifs and if-this-goes-ons are always founded here and hard in today. Whatever today is. To put it another way, nothing dates harder than historical fiction and science fiction. Sir Arthur Conan Doyle’s historical fiction and his SF are of a piece—and both have dated in a way in which Sherlock Holmes, pinned to his time in the gaslit streets of Victorian London, has not.
