The word “empty” carries no semantic content under this construction of the term. Terms like “empty” are always used contextually, hence, why only a fool would correct their partner for mentioning the empty refrigerator by remarking on the presence of air.
Unless you think Sagan would have been surprised by the presence of an electric field (mediated by virtual particles…) between electrons and protons in an atom it’s quite likely you’re choosing an obtuse understanding of the term.
Unless you think Sagan would have been surprised by the presence of an electric field (mediated by virtual particles…) between electrons and protons in an atom it’s quite likely you’re choosing an obtuse understanding of the term.