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I would argue that "products of the imagination are hypotheses, rather than theories. To qualify as a theory, an idea must have some factual basis upon which it can rely for support. All of thoses things you mention wee originally hypotheses, but many of them had advanced to the status of theory before they were actually accomplished. Certainly manned flight and space travel had a pretty sound physical basis well before they were actually achieved.
I already wrote that "atoms" used to be nothing more than products of imagination (theories). And then they were recognized as real things (facts). The same was true with "flying machines," with "talking or seeing over long distances," with "submarines," with "going to the moon," etc. etc.