Edwin Powell Hubble

1889 – 1953

• The nature of science, and other lectures
• The realm of the nebulae
• Photographic investigations of faint nebulae
• The realm of the nebulae
• A general study of diffuse galactic nebulae
• A spiral nebula as a steller system
• Distribution of extra-galactic nebulae
• Distribution of luminosity in elliptical nebulae
• Extra-galactic nebulae
• N.G.C. 6822
• Our sample of the universe
• Red-shifts in the spectra of nebulae