Per the site:
The stories we accept almost always:
- illustrate at least one interesting concept,
- are engaging, and
- clearly explain the science/technology in the story.
The ‘concept’ referenced in point (1) can be anything from new engineering ideas to novel social constructs to abstractions that help illustrate basic properties of reality. Point (2) is far more subjective, although as long as your story consistently moves forward it will probably be engaging. Point (3) is hard to attain without some knowledge of basic science/engineering; we encourage you to learn as much as you can about your subject matter. If your story is very strong in one of the above areas, we will sometimes accept weakness in the other two. Ultimately we are looking for science fiction that is entertaining, scientifically plausible, self-consistent, and technically detailed when appropriate. We have a preference for positive stories, to act as a counterweight to the currently popular post-apocalyptic genre. We certainly won’t dismiss a well-written dystopian future, but we have a bias toward stories that depict technological advancement rather than decay. We do not publish fantasy stories (although we enjoy them!).
Pay rate: 6 cents/word
Length: 1,000-10,000 words per work
For more information, visit: http://compellingsciencefiction.com/submit.html