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Galaxies and Cosmic HistoryModule 5Early Light and the Age of the Universe
Module 5 / Lesson 20 of 2443 min
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Can Independent Cosmic Clocks Disagree?

How do old stars, expansion fits, and early-universe measurements cross-check one another?

Learn how a population of stars records elapsed time, compare two historical age estimates with their uncertainties, and test why stars give the universe a lower age limit rather than an exact birthday.

A dense golden stellar swarm with many fine cream-coloured stars and a few blue-white points against dark space.
Vastward-generated artistic reconstruction of an old stellar population. The stars suggest a population clock; their colours and positions are not measured ages or a reconstruction of NGC 362. Complete original frame.

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