The Stars Are Fire offers an expanded vision of using Cypher as a basis for science fiction, with a 75-page campaign outline and adventure for The Revel—a hard sci-fi setting.
The core rules and character creation outline are in the Cypher core book. TSAF expands on equipment, starcraft and starships, the variations of sci-fi, the hazards, set pieces and optional rules, plus additional creatures, entities and non-player characters, like advanced AI and genetically–modified humans.
I come away wanting to run a hard sci-fi campaign, which, to my mind, bodes well for what TSAF presents as a book. Cypher does a lot of ground work, and TSAF expands on it, but there's still more to do. The Revel campaign frame is hard sci-fi for folk who don't want to just play The Expanse, and Bruce Cordell does fine work offering a starting point. That's sort of what Cypher is about.
TSAF is a core concept for you to build on, not spoon-feeding you a final product. This is a mix of ideas and basics, so you can run an adventure and then see where the narrative path takes you. I think you could probably pull in ideas from other Cypher books—like The Weird, First Responders, and The Strange—and see where the fiction takes you.
You cannot use this book without the Cypher core book, or at least a book that includes the core rules and some form of character creation, as there is no chargen herein. This is a toolbox to expand your options, not a game in its own right.