Why is the sky blue and what color is the sky when space is black

Question

Why is the sky blue and what color is the sky when space is black

Answer 1

Although most visible-light photons pass straight through Earth's atmosphere, a few are scattered randomly around the sky. This scattering is the reason our sky is bright rather than dark- which is why we can not see stars in the daytime. Without scattering, our sky would look like the lunary sky does to an astronaut, with the Sun just a very bright circle set against a black, star-studded background. Scattering also explains why the daytime sky is blue. Visible light consists of all the colors of the rainbow, but the colors are not all scattered equally. Gas molecules scatter blue light (high energy) much more effectively than red light(lower energy). The difference in scattering is so great that, for practical purposes, we can imagine that only the blue light reaches our eyes from all directions and the sky appears blue. At sunset or sunrise, the sunlight must pass through a greater amount of atmosphere on its way to us. Most ofthe blue light is scattered away, leaving only red light to color the sky.  

Answer 2

because you touch yourself at night

Answer 3

The earth is full of dust particles present everywhere(which are not in space since it is a vacuum).When sunlight falls on these dust particles diffused reflection takes place i.e.The light rays are dispersed..thus making these rays visible.The colour you see during the day,night, evening,afternoon,etc is different because of different amounts of diffused light.Since dust particles r absent in space the same process is not present(does not occur) in space

Answer 4

The sky is blue do to a phenomenon called rayleigh scattering that allows light to scatter when it passes through our atmosphere.  Since blue is a color that is easily scattered, the sky reflects that color.  Reds, oranges, and yellows dont scatter as easily. Space is black because it has no atmosphere and there is nothing for light to reflect off.  It just keeps traveling.

Answer 5

The ocean reflects the sun which directly makes our sky blue, just when night comes, it becomes black because like always our sun goes down by each pathed day.

Answer 6

The sky appears to be blue during the day because of how sunlight interacts with the atmosphere.

It is because light from the sun is scattering by atoms and molecules in the atmosphere.

Light scattering by particles depends on the relative "sizes" of the photons and the particles.

In the case of visible light, molecules are much smaller than the wavelength of light, so blue light gets scattered much more than red light.

So as light from the sun enters the atmosphere, more blue photons get reflected (not absorbed) by molecules than red photons - but then the blue photons get reflected again and again until they reach us. So the blue light comes from all over, the red light comes almost straight from the sun.

This is also why the sun looks redder at sunrise and sunset - the light's path through the atmosphere is longer when the sun is on the horizon than when it is high in the sky.

Interaction of light with the atmosphere does all sorts of weird and wonderful things that physics can explain:

http://hyperphysics.phy-astr.gsu.edu/Hba...



So at night the sky should be black - because not much light scatter off it - but in reality we have light pollution. If you want to see a truly black sky youu need to get out into the wilderness at New Moon (so moonlight isn;t a problem) - its pretty awesome!