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The Doppler Effect causes the familiar change in pitch when a siren drives by at high speed.
The Doppler Effect can be used to measure the rotation velocity of galaxies.
Different types of objects would produce different types of rotation curves.

Rotation curves provide strong evidence for dark matter in many galaxies.
Gravitational lensing also provides strong evidence for dark matter within galaxies and galaxy clusters.

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Light Travel Time The Expanding Universe
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