Why the sky blue

It took many centuries and a lot of smart people -- including Aristotle, Isaac NewtonThomas Young, James Clerk Maxwell and Hermann von Helmholtz -- to puzzle out the answer, in part because the solution encompasses so many components: From a physics standpoint, color refers to the wavelengths of visible light leaving an object and striking a sensor, such as a human eye.

Why the sky blue

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Close window Close window This section of the new site isn't ready yet. We've brought you back to the current site. Why is the sky blue? To understand why the sky is blue, we first need to understand a little bit about light. Although light from the sun looks white it is really made up of a spectrum of many different colours, as we can see when they are spread out in a rainbow.

We can think of light as being a wave of energy, and different colours all have a different wavelength. At one end of the spectrum is red light which has the longest wavelength and at the other is blue and violet lights which have a much shorter wavelength.

When the sun's light reaches the Earth's atmosphere it is scattered, or deflected, by the tiny molecules of gas mostly nitrogen and oxygen in the air. Because these molecules are much smaller than the wavelength of visible light, the amount of scattering depends on the wavelength.

This effect is called Rayleigh scattering, named after Lord Rayleigh who first discovered it. Shorter wavelengths violet and blue are scattered the most strongly, so more of the blue light is scattered towards our eyes than the other colours.

You might wonder why the sky doesn't actually look purple, since violet light is scattered even more strongly than blue. This is because there isn't as much violet in sunlight to start with, and our eyes are much more sensitive to blue.

The blue light that gives the sky its colour, is sufficiently bright to make all the stars that we see at night disappear since the light they emit is much dimmer. Why does the blue fade towards the horizon? You might also notice that the sky tends to be most vibrant overhead and fades to pale as its reaches the horizon.

This is because the light from the horizon has had further to travel through the air and so has been scattered and rescattered. The Earth's surface also plays a role scattering and reflecting this light.

You might also like: The explanation begins with the ultimate source of light in our solar system:
Why is the sky blue? Original by Philip Gibbs May Why is the sky blue?
About us Why is the sky blue? After days of rain, a patch of blue sky is a sight for sore eyes.

As a result of this increased amount of scattering, the dominance of blue light is decreased and so we see an increased amount of white light.[Physics FAQ] - Original by Philip Gibbs May Why is the sky blue? A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light.

After days of rain, a patch of blue sky is a sight for sore eyes. But why is the sky blue? So, when the Sun is high in the sky, blue light is scattered in all directions as sunlight passes through the atmosphere and we see the sky as blue.

But it’s a different case when the Sun is close to the. During daylight, the sky appears to be blue because air scatters more blue sunlight than red.

Why does the blue fade towards the horizon?

At night, the sky appears to be a mostly dark surface or region spangled with stars. During the day, the Sun can be seen in the sky unless obscured by clouds. In the. After days of rain, a patch of blue sky is a sight for sore eyes.

But why is the sky blue? Let’s start with the Sun. Light from the Sun appears white but it actually consists of many different colours. Why is the Sky Blue? The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through.

Little of the red, orange and yellow light is affected by the air. Why is the Sky Blue? On a clear sunny day, the sky above us is a brilliant blue.

Why the sky blue

In the evening, the sunset puts on a beautiful show of reds, pinks and oranges.

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