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General aspects about the thermodynamics of astrophysical systems arediscussed, overall, those concerning to astrophysical systems in mutualinteraction (or the called \emph{open astrophysical systems}). A specialinterest is devoted along the paper to clarify several misconceptions that arestill common in the recent literature, such as the direct application to theastrophysical scenario of notions and theoretical frameworks that wereoriginally conceived to deal with extensive systems of the everyday practice(large systems with short-range interactions).

Remarks about the thermodynamics of astrophysical systems in mutual interaction and related notions