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Galaxies and Cosmic HistoryModule 4Expansion, Redshift, and Distance
Module 4 / Lesson 15 of 2440 min
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Why Does Cosmic Distance Need a Ladder?

How does each distance method calibrate the reach of the next one?

Connect a geometric anchor to Cepheid stars and standardized supernovae, then remove the anchor to see which distances become unknown.

Concept art places a bright foreground star, a large spiral galaxy with a bright stellar point, and smaller distant galaxies in one field.
Vastward-generated concept art of successive distance indicators. Apparent sizes and brightnesses are artistic choices, not a calibrated distance scale.

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