A star moving away from earth shows?

Explanation

When a star emits light, the color of its light as observed on earth depends on its motion relative to earth. If a star is moving towards the earth then its light is shifted to higher frequencies on the color spectrum (towards the gamma-ray end of the spectrum). This shift towards higher frequency is called a "blue shift". The faster a star moves towards the earth, the more its light is shifted to higher frequencies. In contrast, if a star is moving away from the earth, its light is shifted to lower frequencies on the color spectrum (towards the orange/red/infrared/microwave/radio end of the spectrum). A lower frequency shift is called a "redshift". The faster a star moves away from the earth, the more its light is shifted to lower-frequency colors. This effect is known as the "Doppler shift".