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Another effect of a laser being fired in the direction of motion as it approaches an observer is the color shift. If the beam is approaching an observer and the emitting device is moving at relativistic velocities (and even non-relativistic velocities), the approaching light is blue shifted as the wavelength is compressed. It could be compressed so much you get a fatal dose of X-rays or gamma rays as the once visible wavelengths are blue shifted. In the other direction, away from the observer, the wavelengths are red shifted being stretched into long radio waves as the observer detects them. Because the velocity of light is constant all other variables adjust to compensate. Physics is fun