What is the color of spectrograph as objects move forward or away from the objects?

As objects move away from an observer, their light is redshifted, meaning the spectral lines shift toward the red end of the spectrum, indicating longer wavelengths. Conversely, when objects move closer, their light is blueshifted, with spectral lines shifting toward the blue end of the spectrum, indicating shorter wavelengths. This phenomenon is primarily due to the Doppler effect, which affects how we perceive the wavelength of light from moving objects.