There is a philosophy that says that if something is unobservable -- unobservable in principle -- it is not part of science. If there is no way to falsify or confirm a hypothesis, it belongs to the realm of metaphysical speculation, together with astrology and spiritualism. By that standard, most of the universe has no scientific reality -- it's just a figment of our imaginations.

Summary

This quote suggests that according to a particular philosophy, for something to be considered part of science, it must be observable or potentially observable. If a hypothesis cannot be confirmed or disproven, it is categorized as metaphysical speculation, on par with astrology and spiritualism. Consequently, a significant portion of the universe would lack scientific reality, existing only in our imaginations.

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