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Which planet appears blue because of absorption of red ight?

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What does a blue and red shift of absorption lines in a spectrum indicate?

  Blue shift is a decrease of a signal's wavelength, and/or an increase in its frequency, due to the Doppler Effect. This indicates that the object is moving towards the o

Why does the planet Mars appear red?

Mars appears red because it consists mostly of iron oxide, aka, rust. Iron rusts and turns red when it comes in contact with oxygen, and so because Mars is iron rich, and that