Question

Look at the spectrums of a motionless light source and a star moving away from Earth.



Which of these is a correct inference that can be draw from the observation of the two spectrums?

The spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes.

The spectrum of a motionless star is identical to the spectrum of a star which moves away from Earth.

The spectrum of a star shifts towards the red region when the star moves away from Earth.

The spectrum of a star shifts towards the blue region when the star moves away from Earth.