fill the blank with the word 'cosmological redshift' or 'doppler shift' A ? occurs because of the stretching of space between the source and observer.
fill the blank with the word 'cosmological redshift' or 'doppler shift'
A ? occurs because of the stretching of space between the source and observer.
A variation in the wavelength or frequency of a photon having non-zero radial velocity according to the movement of the body towards or away from the observer is known as Doppler shift. In other words, the measurable change in the wavelength between the source and the observer is called a Doppler shift
There occurs a shift in emission spectra of the distant stars occurring at the red terminal of the electromagnetic spectrum. Such things only occur to an observer. After observing this, scientists obtained a conclusion that there is something which causes the wavelength to stretch. Stars occur within the galaxies and the movement of galaxies clear that there is the expansion in the space, which causes the shift in the emission spectra.
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