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Read the Light of the UniverseModule 3Motion, Brightness, and Distance
Module 3 / Lesson 10 of 2428 min
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Not Every Redshift Means the Same Thing

How do Doppler, gravitational, and cosmological redshift differ even when the spectrum looks displaced?

Separate three physical causes before translating a wavelength shift into a story about motion or expansion.

A light wave passes through scenes of relative motion, deep gravity, and an expanding galaxy field.
Vastward artistic reconstruction. The three mechanisms are separated explicitly in the interactive comparison.

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