Using Scopus and national sources, I have investigated the evolution of the cost of publishing in Danish astronomy on a fine scale over a number of years.I find that the number of publications per year from Danish astronomers increased by a factor of four during 15 years: naturally, the corresponding potential cost Ski de fond - Accessoires - Fixations - Skate of publishing must have increased similarly.The actual realized cost of publishing in core journals are investigated Sea Glass Rings for a high profile Danish astronomy research institutions.
I argue that the situation is highly unstable if the current cost scenario continues, and I speculate that Danish astronomy is risking a scholarly communication collapse due to the combination of increasing subscription cost, increased research output, and increased direct publishing costs related to Open Access and other page charges.