 We will return to discuss Hawking radiation in more detail in  section 6.1  below, but for now we note that this all raises deep questions about inter-theoretic relations that philosophers have not yet come to grips with: although it seems undeniable, what does it mean to say that a purely gravitational system is also “a thermodynamical  object”?[13]  How can the concepts and relations of one theory be translated so as to be applicable in the context of a radically different one? (See the entries  Scientific Unity  and  Intertheory Relations in Physics.)  