Who first used a telescope in 1610 to prove the Milky Way was composed of countless individual stars?

Answer

Galileo Galilei

Galileo Galilei, utilizing his improved telescope in 1610, resolved the nebulous glow into innumerable points of light, demonstrating that the Milky Way was not a uniform cloud but a dense swarm of distant stars.

Who first used a telescope in 1610 to prove the Milky Way was composed of countless individual stars?
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