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SlideshowReport

Big Bang Theory

Description
Expanding universe
Most galaxies exhibit a red Doppler shift
Moving away
Far galaxies have greatest shift

Doppler effect
Change in the wavelength of light emitted by an object due to its motion
Movement away stretches the wavelength
Longer wavelength
Light appears redder
Movement toward “squeezes” the wavelength
Shorter wavelength
Light shifted toward the blue
Amount of the Doppler shift indicates the rate of movement
Large Doppler shift indicates a high velocity
Small Doppler shift indicates a lower velocity
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