Edwin Hubble's 1936 work, The Realm of the Nebulae, is a foundational text in astronomy detailing his research on extragalactic nebulae. It presented the observational evidence for an expanding universe and established the extragalactic nature of spiral nebulae.
Sources for Edwin Hubble — The Realm of the Nebulae
Edwin Hubble — The Realm of the Nebulae in Astronomy
Held in the Astronomy chamber of the Babel Nexus Index.
- Galileo Galilei — Sidereus Nuncius (1610)
- Arthur Eddington — Space, Time and Gravitation (1920)
- Agnes M. Clerke — A Popular History of Astronomy During the Nineteenth Century (1885)
- Robert S. Ball — The Story of the Heavens (1886)
- Johannes Kepler — Astronomia Nova (1609)
- Camille Flammarion — Astronomy for Amateurs (1904)
- Simon Newcomb — Side-Lights on Astronomy (1906)
- Percival Lowell — Mars (1895)
- Nicolaus Copernicus — De revolutionibus orbium coelestium (1543)
- John Herschel — A Treatise on Astronomy (1833)
- Edmond Halley — A Synopsis of the Astronomy of Comets (1705)