One characteristic is the blend of two different genres. It combines the imaginative and often futuristic or otherworldly concepts of science fiction with the emotional and relationship - focused aspects of romance. For example, it might have a love story set on a spaceship traveling to another galaxy.
I would recommend 'Foundation' by Isaac Asimov. It's a classic 'livre sciences fiction' that deals with the idea of psychohistory and the fall and rise of galactic empires. It's full of interesting characters and thought - provoking concepts.
Cathy Maxwell in Fantastic Fiction is an author whose stories can be found on the Fantastic Fiction platform. She has probably contributed some engaging tales. It could be that her writing style, which might include elements like strong character development and interesting plotlines, has made her works appealing enough to be part of Fantastic Fiction. Maybe her books have received good reviews on the site, which has increased her visibility there.