Doppler effect
The doppler effect is not just in space with the red shift as the universe is expanding, it is all around us. Ever hear a car as it is speeding passed, how it gets louder and higher pitched as it gets closer and quieter and lower pitched as it gets farther away. Well that happens because when an object moves the sound waves get really close together and create a higher frequency and when they are behind the object they tend to get pulled. The speed of sound is when the waves are moving at the same frequency as the sound travels through the air.
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