When a source of ____ is ____ relative to a ____ observer, the wavelength and ____ of the wave appears to change. In a light wave, if the source is moving ____ from the observer then the wavelength becomes ____ - it becomes more ____. This is called ____. However, if the source of waves is moving towards the observer then the wavelength becomes ____ - it becomes more ____. This is called ____. The ____ the source is from the observer, the ____ it is moving and the ____ the change in wavelength.

Red shift

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