What specific finding did Galileo provide that laid groundwork for later cosmological interpretations by figures like Kant?

Answer

Evidence of immense stellar population density

Galileo provided the crucial, direct, observable evidence regarding the sheer density of stars within the Milky Way band, which later thinkers interpreted as evidence that the structure was an island universe.

What specific finding did Galileo provide that laid groundwork for later cosmological interpretations by figures like Kant?
HistoryGalileoastronomytelescopeMilky Way