What was the title of Galileo's momentous publication released in March 1610 announcing his astronomical findings?
Answer
Siderius Nuncius
Galileo compiled and announced his revolutionary findings concerning Jupiter's companions, along with other telescopic discoveries, in his highly influential publication titled *Siderius Nuncius*, which translates to *The Starry Messenger*. This publication was released in March 1610. This formal announcement was the step that transformed his private observations into verifiable, public scientific evidence, thereby challenging the prevailing geocentric cosmology that had been accepted for centuries. Although the text mentions the English translation, *Siderius Nuncius* is specifically identified as the momentous publication.

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