Final answer:
Redshift occurs when an object moves away, causing a shift to longer wavelengths in the spectrum.
Explanation:
Redshift is the shift in the position of spectral lines to longer wavelengths due to the relative motion of a source away from the observer. If an object is moving away from us, the observed wavelength will be longer, leading to a red shift in the spectrum.
Learn more about Redshift and Doppler Effect here:
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