“China has a missile that was previously thought impossible”
Yes, China has a missile nobody thought could be created, but there is evidence it can exist; that it could have been created. This evidence is observation that other missiles exist and technology applied and working in other areas has a potential to be applied to create supersonic missile technology.
This is the first phase of scientific methodology: observation.
The theory of flying bombs is more than just theory. “Flying” bombs exist. We know it. In science terminology, we call this observation. Predicting, another phase of science, is extending already observed realities using existing technology, not theory. This makes an extension of known observations possible and believable.
This extension is not possible where there is no observation such as fake disciplines of climate changeling and “space” travel/globe-theory.
Again, theory based on theory is bad theory and can predict absolutely nothing except silly imagination.
This fertilization of imagination-based theory is the core of modeling in “science” today, particularly climate changeling and globe-earth theory and “space” travel/globe-theory.
If all one can produce is unobservable imagination of modeling and fake theory based on unsubstantiated theory, then one has nothing. When theory is based on theory, there is no evidence from which a reality can be extrapolated. This is climate changeling today, and globe-eath/space speculation.
All one need to do, to observe the unobservable climate-changeling and “space travel/globe-theory theories, is to pay attention to the words of those who promote: “models”.