[izzydata]

They have different writing styles generally, but it is still pointless to call Star Trek a fantasy for the same reason why you wouldn't call Lord of the Rings a science fiction. If you have a spectrum from fantasy to science fiction with 5 being the middle then maybe Star Trek would be a 6 and Star Wars being more of a 5.

Personally I'd classify Dune to be more of a fantasy than Star Trek just because of the style it is written in being very mystical and prophetic.

[kvgr]

For me it is a mix of things, i referenced Star Trek because author of the comment mentioned it in comparison. But for me fantasy is in the past in the "better times" and magic. SciFi for me looks into the future or alternative reality enhanced by technology.

Dune for me is SciFi, because space, spaceships, and very little magic. It is about comparison of societies rejecting and embracing technology, with little magic on top.