This episode explores theories in Physical Cosmology and how Humankind has represented the universe since before the emergence of modern science, as well as alternative theories that were later abandoned:

· The Ancient Greek and Medieval Theory of Spheres.

· Heliocentric models of the 16th and 17th centuries, such as the one proposed by Copernicus.

· The Steady-State Universe Theory of the 19th and 20th centuries.

· The Big Bang Theory, which is the standard model describing the history and expansion of the universe.

· Alternative hypotheses that were later abandoned, and the reasons why, such as Tired Light or Plasma Cosmology.

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Journey to the Center of the Universe | Space Sleep Story 01:02:19 Share

Lights Out Library: Sleep Documentaries

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Journey to the Center of the Universe | Space Sleep Story