Abstract

Alexander Friedmann, Carl Wilhelm Wirtz, Vesto Slipher, Knut E. Lundmark, Willem de Sitter, Georges H. Lemaître, and Edwin Hubble all contributed to the discovery of the expansion of the universe. If only two persons are to be ranked as the most important ones for the general acceptance of the expansion of the universe, the historical evidence points at Lemaître and Hubble, and the proper answer to the question, “Who discovered the expansion of the universe?”, is Georges H. Lemaître.

Highlights

  • The history of the discovery of the expansion of the universe is fascinating, and it has been thoroughly studied by several historians of science. (See, among others, the contributions to the conference Origins of the expanding universe [1]: 1912–1932)

  • In 1922, the Hungarian physicist Cornelius Lanczos demonstrated [7] that if one describes the de Sitter universe in a freely falling reference frame, this universe model appeared as an empty universe with accelerated expansion due to the natural tendency of space to expand

  • There is close to equilibrium between the attractive gravity due to matter and age of the universe model is in agreement with observational data by adjusting the magnitude of the the repulsion due to the cosmological constant

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Summary

Introduction

The history of the discovery of the expansion of the universe is fascinating, and it has been thoroughly studied by several historians of science. (See, among others, the contributions to the conference Origins of the expanding universe [1]: 1912–1932). The history of the discovery of the expansion of the universe is fascinating, and it has been thoroughly studied by several historians of science. (See, among others, the contributions to the conference Origins of the expanding universe [1]: 1912–1932). I will present the main points of this important part of the history of the evolution of the modern picture of our world

Einstein’s Static Universe
The De Sitter Universe
The Friedmann Universe Models
The Contributions of Lemaître
Results before
Thetowards radial us velocities
The Years from 1920 to 1925
Hubble’s in 1929
Hubble’s velocity-distance diagram
Lemaître’s 1927 Article is Translated to English
The sections
10. Einstein’s Reaction
Einstein’s equations they appear a manuscript from January
12. Eddington’s 1932-Description of an Expanding Universe
13. Hubble’s Interpretation of the Observations
14. Summary on the Discovery of the Cosmic Expansion
Full Text
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