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  • Why is the sky not purple? - Physics Stack Exchange
    The net effect is that the red and green cones are stimulated about equally by the light from the sky, while the blue is stimulated more strongly This combination accounts for the pale sky blue colour It may not be a coincidence that our vision is adjusted to see the sky as a pure hue
  • optics - Why does the sky look black in pictures taken from the summit . . .
    In pictures taken from the summit of Mount Everest (such as this one), the colour of the sky is a very dark blue or even black in some pictures I remember from my own experiences of hiking in the Himalayas that the sky appeared to be darker blue as I climbed higher
  • optics - What makes some laser beams visible and other laser beams . . .
    22 What makes the beam of some lasers: visible? such as the ones used in clubs or such as the laser pointers sold at amazon which if pointed to the sky look like a solid visible beam of light crossing the sky (it reminds me of the lightsaber in Star Wars) invisible? such as the ones used in pointers for presentations
  • Why can I never see any stars in the night sky?
    2 What color is your sky during the day? If it is deep blue, then you should see lots of stars at night even in a large city If your daytime sky is very light blue though, or worse, pale grey, white, brown, or orange, then you have a problem City light polution will light up this haze at night and make it impossible to see any stars
  • visible light - Why is air invisible? - Physics Stack Exchange
    Rayleigh scattering is basically why sky is blue (and why it would be blue even if the air contained no oxygen) The scattering is inversely proportional to wavelength to 4th power, so the blue light is scattered a lot more than red light
  • Why is the blue color of sky darker in high altitude regions?
    The sky is actually black Check that for yourself at midnight So in the daytime, you are looking at a black sky that is "illuminated" by mostly blue scattered sunlight The higher your altitude, the dimmer is the blue scattered illumination, so you start to see more of the basic black of the sky You can test this on your computer display, by going to the color palette and setting it to full
  • Why does the sky suddenly look gray through this window?
    But why does it look so much less blue, when the values of the red and green channels are still smaller than the blue? That is entirely an effect of human perception
  • visible light - Why is the sky blue? - Physics Stack Exchange
    Possible Duplicate: Why does the sky change color? Basically what the title says What mechanisms are significant and how do they contribute to make the sky blue Also when the sky is not blue,
  • How can sunlight be white , but pictures of the sun be orange?
    The main reason why the sun doesn't look white is due to Rayeleigh Scattering means that the blue light from the sun is scattered so it appears to be yellow or even orange when viewed through thicker atmosphere This means that when you take a photograph of the sun (through the necessary filters) from the surface of the earth it will appear yellow or even orange
  • Why is the sky of the moon always dark? - Physics Stack Exchange
    So, the sky which scatters blue wavelengths appears blue and red yellow wavelengths of sun survive to reach our eyes to give it its color Mie scattering: For larger sized particles, all wavelengths are scattered identically It is caused by larger particles like water droplets in clouds That's why they appear white or grey





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