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Using Scopus and national sources, I have investigated the evolution of the cost of publishing in Danish astronomy on fine scale over a number of years. I find that e.g. the number of publications per year from Danish astronomers increased by a factor of 4 during 15 years: naturally, the corresponding potential cost of publishing increased similarly. The actual realized cost of publishing in core journals are investigated for high profile Danish astronomy research institutions and compared to the corresponding library license expenditures for those particular core journals. It is illustrated that the situation is highly unstable if the current cost scenario continues, and I speculate that Danish astronomy is risking a catastrophic collaps due to the combination of increasing subscription cost, increased research output, and increased direct publishing costs related to Open Access and other page charges.