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Galaxies and Cosmic HistoryModule 4Expansion, Redshift, and Distance
Module 4 / Lesson 14 of 2440 min
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Does Every Redshift Mean the Same Kind of Motion?

How do Doppler motion, gravitational effects, and cosmic expansion enter a measured spectrum?

Match spectral lines, reproduce the same redshift with three different physical contexts, then combine expansion with an approaching local motion.

Concept art of light from a galaxy entering a small optical prism and separating into a muted spectrum.
Vastward-generated concept art. The optical element suggests separating light by wavelength; it is not an instrument diagram or measured spectrum.

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