Why does the moon seem white?

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The moon reflects the light of the sun. Nevertheless, it seems to give off white light, whereas the sun usually looks yellow. This is an optical illusion.

The moon looks whiter because it is higher.
The moon looks whiter because it is higher. © Peter_Böni / Pixelio

The moon doesn't shine by itself

  • The moon does not emit its own light, but only reflects the light from the sun that hits it. Since the moon rocks are not colored, all of the light is thrown back into space.
  • So it would have to have the same light color as that of the sun. It is like that too.
  • In fact, you do not see the sun in its actual light when you look at it.
  • When the sun is high in the sky, it is too bright to see without protection for the eyes. Any useful protection will also change the color of the light. So you don't see that the light of the sun is white.
  • When the sun is lower in the sky and can therefore be viewed better, the atmosphere is just as protective. The blue components of the sunlight are deflected more strongly than the red and yellow components. Therefore, the sunlight appears yellow to reddish in color closer to the horizon.
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  • You can usually see the moon when it is very high in the sky. The reflected light can get to your eyes straight through the earth's atmosphere without being scattered. When the moon can be seen lower on the horizon, it doesn't look quite as white as usual.

Why aren't the planets all white?

  • Most stars in the night sky look white to the naked eye because the light from most suns contains the entire spectrum of colors.
  • On closer inspection, the planets are not quite as white, because even a planet does not shine itself, but only reflects sunlight.
  • Depending on the color of the surface, however, the light is not fully reflected, so the light that is reflected back from Mars appears red, for example.
  • Scientists can even see a slight tinge of blue or red in the light from stars that are far away, depending on whether the star is moving towards or away from the earth.

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