@Fritzd
yes, i do not pretend to be a scientist nor will i engage scientists with scientific problems, i leave scientific issues to physicists like you. But to clarify my point, scientific theory is a product of a scientific process or methodology, which makes something scientific. But the very process or framework that legitimize something as scientific cannot be scientific. It cannot, so to speak, have its cake and eat it too! The question is not really about the relation between domains in science, i.e., general relavity and quantum mechanics, (it can even be said that if you do not know classical mechanics then you will not be able to grasp quantum mechanics, that although they operate in different domains, demarcated by the planck level, the latter can only be understood in in its break from newtonian mechanics, in math this is also true, between prime, rational, irrational, fractions...., the domains are there because of theoretical limitations) the question is about science itself. how does it account for itself to be true, via automatic legitimation? via a set of criteria - but what lends this criteria any justification to be scientific?
TO clarify my point, to justify something as scientific you have a criteria, say the scientific methodology or framework, but what justifies the criteria, what justifies a scientific methodology or framework to be scientific? Truth-claims discovered by science is due to a certain set of criteria, but what determines the truth-claims of this set of criteria?
a kernel of scientific methodology is induction. But we know that induction is logically problematic because the connection between phenomenon A to phenomenon B is merely contingent and not necessary. This old epistemic issue is called the problem of induction.
@rodion put it this way, you cannot use the principle of verifiability dear to science to determine that the principle of verifiability is in itself verifiable. This is not a twisted account of science, but rather a real theoretical issue in science as a whole, which is in line with the topic "what is scientific theory?" Since the topic is theoretical in nature, then i presented a theoretical reply. Would it have been a discussion or a solution to the age old three bodies problem, then i would, with all honesty, leave it to scholars like fritzd et al.
cheers!