A galactic accident causes a red giant star to be moving on a collision course with our solar system. This star is moving very fast, and its light is Doppler shifted. Which of the following statements might be true? Assume light from the star would fall in the red part of the visible spectrum if the star were not moving relative to our solar system.
(a) Light from the star is observed as blue.
(b) Light from the star is observed as X-rays.
(c) Light from the star is observed in the infrared.
(d) Light from the star interferes with cell phone reception.