when will a scientist observe redshift in the spectrum of a distant space object

Answer 1

A scientist can observe redshift in the spectrum of a distant space object whenever the light from that object is observed to have longer wavelengths than expected. This can occur when the object is moving away from us, causing the light to be stretched out and appear more red. The amount of redshift will depend on the velocity of the object and the distance between the object and the observer. Scientists have already observed redshift in the spectra of a variety of distant space objects, such as galaxies, quasars, and supernova.