In what year did Galileo Galilei publish his findings detailing that the Milky Way was a mass of innumerable stars?

Answer

1610

Galileo meticulously recorded and published his findings, including the description of the Milky Way, in the pamphlet *Sidereus Nuncius* in the year 1610.

In what year did Galileo Galilei publish his findings detailing that the Milky Way was a mass of innumerable stars?
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