American astrophysicist Ethan Siegel addresses a fundamental question about the nature of light in his 'Ask Ethan' column: can light 'age' or lose energy over time? The article explores the 'tired light' hypothesis, proposed by Fritz Zwicky in the 1930s as an alternative explanation for the redshift of galaxies. The author explains in detail why this hypothesis was refuted by the scientific community, despite its historical significance. Siegel also notes that Zwicky was the pioneer behind the theory of dark matter. The piece examines the fate of photons in the context of the universe's infinite expansion, providing readers with a deep scientific perspective on cosmological processes. This translation allows the audience to engage with current scientific debates and the refutation of outdated theories that are still occasionally used to challenge modern cosmology.
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