The Doppler shift doesn't just work on sound, it also works on light. Things going really fast towards you are blue-shifted in color, while things going really fast away from you are red-shifted.
Based on a picture taken by the Apollo 17 crew, December 8, 1972, 18,000 miles from home.
Solar Flare activity is fascinating to me. The fact that, had I chosen to depict it in scale, the entire earth could fit easily under the arc of the flare I have drawn boggles my mind.
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