- Interested in "invisible" stars
- Thought the milky luster in the sky was made up of small stars clustered together
- He proved this assertion by sketching "nebulae" that were actually stars
Harlow Shapley:
- First to realize that the galaxy was much larger than previously believed
- Found that the Sun's location in the galaxy is in a nondescrpit location
- supports the Copernican Principle
- Participated in the "Great Debate" against Heber D. Curtis on the nature of nebulae, galaxies, and the Universe
- argued that spiral nebulae (now called galaxies) are inside our Milky Way
- opposed Curtis and Hubble, but was terribly wrong
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