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Galaxies and Cosmic HistoryModule 4Expansion, Redshift, and Distance
Module 4 / Lesson 13 of 2438 min
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What Does It Mean for the Universe to Expand?

What changes when cosmic scale grows, and what familiar explosion picture should we avoid?

Compare distances between the same model galaxies at two cosmic times, move the observer from A to B, and inspect why a bound galaxy does not grow with the large-scale spacing.

An original artistic field of separate spiral and elliptical galaxies with broad dark gaps and no privileged central object.
Vastward-generated concept art of separated galaxies. This still illustration does not measure expansion; the interactive model below explains what changes.

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