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Thread: Why stars moving towards earth show a blue shift and those moving away show a...

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    Default Why stars moving towards earth show a blue shift and those moving away show a...



    ...red shift? Why stars moving towards earth show a blue shift and those moving away show a red shift?

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    when you move away from me at high velocities the light coming from you is stretched (loger wave length) so its shifted to the red, shifting to blue means the light wave is moving towards us (shorter wave length).
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