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This page is physically blank. The text visible in the transcription is a "ghost image" or bleed-through, where the heavy ink from the title page on the reverse side has seeped through the paper fibers over the centuries.
The mirrored text from the recto (front) includes the title "SIDEREUS NUNCIUS" and the author's name, "GALILEO GALILEI." In early modern printing, thin paper often resulted in this type of ink transfer, which can be seen when viewing the back of a page.