The first standardized catalog of all known galaxies beyond the Milky Way (“extragalactic nebulae”) is published, enabling early exploration of large-scale characteristics of the universe. Humason, Mayall & Sandage 1956
The American Astronomical Society (AAS) have partnered with IOP Publishing to create an exciting new collection of astronomy and astrophysics ebooks to further the AAS mission: "to enhance and share humanity's scientific understanding of the universe."
In keeping with our mission, the entire AAS journals portfolio was made freely accessible as of 1 January 2022. Read more.
