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What is the definition of redshift?

Updated: 8/11/2023
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15y ago

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Due to the Doppler effect, the faster a body moves away from you the larger its wavelength - meaning it tends to get more red.

It was discovered that the further away a galaxy is from us, it is moving faster. So large redshift means a galaxy that is very far away.

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15y ago
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15y ago

Light coming towards you will have it's wavelength compressed and the light will visibly shift to the high end of the spectrum (violet). This is called blue shift. If the light source is receding, the wavelength is spread out and this is a shift toward the red end of the spectrum, red shift.

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14y ago

Red shift is caused by object in space moving away from us. As space expands it appears that stars are moving away from us and are redshifted. From the red shift it is possible to estimate how far away the star is because stars further away are moving away faster.

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