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This seems plausible. In science unobservable objects are postulated to explain the observable. As such, they can hardly be considered "real" in the same way as observable ones.
Naturally the main problem in Van Fraassen's theory is explaining the difference between observable and unobservable phenomena. Surprisingly, he leaves the problem for empirical science and goes on explaining his philosophical standpoints as if the problem had been solved. This, of course, is far from the truth. For instance, evidence of many objects in astronomy can only be derived from other observations. Still, it doesn't seem to be just a pragmatic question whether there are, for example, planets outside of our solar system.
Van Fraassen's main idea is to combine realistic and pragmatic viewpoints by the scientific object's empirical status. Being a realist for observable objects and a pragmaticist for unobservable objects, he names himself a constructive empiricist for scientific objects in general. As such, it's an intriguing crossover between epistemological positions...and very much a common sense one as well.
Also notable is Van Fraassen's ability to present complex philosophical viewpoints in an understandable manner. His introduction to scientific realism is one of the best I've read.
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