
New Books in the History of Science Emilio Elizalde, "The True Story of Modern Cosmology: Origins, Main Actors and Breakthroughs" (Springer, 2021)
Aug 9, 2025
Emilio Elizalde, an Emeritus research professor at the Spanish Higher Council for Scientific Research, delves into the evolution of modern cosmology. He discusses key breakthroughs by astronomers like Hubble and the implications of Einstein's general relativity. The conversation highlights the transformative journey from ancient myths to scientific understanding, the role of pivotal debates, and misconceptions surrounding the Big Bang. Elizalde also emphasizes how these advancements redefined our cosmic perspective, revealing a vast, dynamic universe filled with mysteries.
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Modern Cosmology Began In 1912
- Elizalde dates modern cosmology to 1912 when Leavitt's distance law and Slipher's radial velocities became available.
- He argues those two tools let scientists compute positions and velocities and treat the universe as a many-body physical system.
Static, Eternal, Milky Way‑Centered View
- Before the 20th century, scientists assumed the universe was eternal, static, and essentially the Milky Way.
- Elizalde explains these beliefs arose from thermodynamic reasoning and severe observational distance limits.
Hubble Found The Law, Not The Belief
- Elizalde notes Hubble discovered the linear redshift–distance relation but personally doubted it implied real expansion.
- He explains Hubble favored 'tired light' and was skeptical because his distance scale made expansion imply an impossibly young universe.

