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Why is the red line of the distant galaxy's spectrum missing, and what might that mean about the galaxy?Astronomers compared the spectra from two different stars in our galaxy. It was noted that the Doppler shift suggested that the two stars are moving relative to us with the same speed. It was also noted that the stars moved relative to us with different velocities. Explain how this can be true.A spectroscope breaks electromagnetic radiation up into its constituent parts. This can be accomplished with refraction and with diffraction. Explain how astronomers can use the spectrum to determine the temperature of the object that produced the electromagnetic radiation.Astronomers observe a supernova remnant and a planetary nebula with a spectroscope. In terms of velocity, compare the Doppler shifts observed with each of these objects. Justify your