Although they are definitely based on science facts, sometimes rather fantastic facts, you are not likely to find DVDs with a season's episodes of "House MD,"
"Bones," or any of the various "CSI" shows shelved with the Science Fiction DVDs.  We just don't consider those stories to be science fiction.

How about shows like "Apollo 13," "Space Cowboys," or "Men in Black"?

"Apollo 13" seems more like historical fiction, if you consider it fiction.  "Space Cowboys" is definitely fiction, but is it really science fiction?  Okay, "Men in Black," even with its flaws (did you notice them?) is definitely science fiction.  We know it when we see it!

In his book, "How to Write Science Fiction & Fantasy," Orson Scott Card says that science fiction is "whatever today's publishers say is science fiction." He also points out that we will probably consider any book by a well known science fiction writer to be science fiction. Which is just a variation of Justice Stewart's definition.

Perhaps the third definition of "define" in my "Webster's" will help us: "to give the distinguishing characteristics of."