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How do we know the light is shifting as opposed to chemical reactions changing the chemical composition of the object?

April 26, 2017changing chemical chemical reactions composition light object shifting

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How do we know the light is shifting as opposed to chemical reactions changing the chemical composition of the object?

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Typically, a change in chemical composition would result in a completely different pattern of lines- it’s a different fingerprint. Doppler shift due to motion of the source moves a particular pattern to the left or right, rather than changing the relative spacing between the lines.