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Galileo discovered that the Milky Way is made of many stars.
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Immanuel Kant theorized that the galaxy has a planar structure, some nebulae might actually be entire other galaxies or island universe.
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William and Caroline Herschel conducted the frist "all-sky survey" and calalouged 5000 nebulae resolving some into their individual stars.
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willaiam Parson used a 72-inch telescope and classified the nebulae into featureless ellipticals and whirlpool like spiral nebulae.
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Kaypten used stellar parallax to estimate the true size of the galaxy.
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observed that globular clusters are distributed asymmetrically in the sky
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Edwin Hubble discovered that the Milky Way is one of many galaxies.
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Actual size of galaxy and the suns location was fully determined.
