Galileo - Found that Milky Way Galaxy was full of stars and not just nebulae.
Immaneul Kant - Observed spiral nebula, believed that the Milky Way was the universe and the galaxy had a disc shape.
William Herschel - Provided many measurements to estimate distances and position in the Milky Way.
Henrietta Leavitt - Period and luminosity relation.
Harlow Shapley -Used a new telescope and the RR Lyrids and Cepheids to measure the distances to the globular clusters and that we were not near the center of the galaxy.
Heber Curtis - Believed that the universe had separate islands in the sky and wasn't one conformed group galaxy.
Edwin Hubble - Able to measure stars in other galaxies and show that there were many other things out there.
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