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In observing the stars, Galileo reported that he saw at least ten times as many stars through the telescope as with the naked eye, and he published star charts of the belt of Orion and the Pleiades showing some of the newly observed stars.
Also, when he observed some of the " nebulous " stars in the Ptolemaic star catalogue, he saw that rather than being cloudy, they were made of many small stars.
From this, he deduced that the nebulae, and the Milky Way itself, were collections of stars too small and far away to be resolved into individual stars by the naked eye.

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