Describe the direction of the shift of the galaxy in motion spectra lines compared to the spectra lines of the stationary galaxy when you move the slider to a closer distance towards you?
1 point
a. The spectra lines of the galaxy in motion shift towards the blue side of the spectrum.
b. The spectra lines of the galaxy in motion do not shift.
c. The spectra lines of the galaxy in motion shift towards the red side of the spectrum.