I was going to answer your question about what
makes the sky blue, but when I went online, I found an
answer that was so much better than I could have
written, I decided to just put the link here.
NASA’s explanation for why the sky is blue:
If you want a more in-depth explanation, I
recommend you read this one:
In summary, the sky is blue because of light
scattering. When light hits the molecules in the
blue light is more likely to scatter (bounce off
in all directions) while low-energy red light is more
likely to continue going straight. When we look
up, we see all the blue light that has been scattered.
When we look to the horizon, the light we see had
to travel further, so most every color of light gets
scattered by the time it reaches our eyes, so the
horizon appears white, the mixture of all colors.
The reason the sky is blue has to do with tiny
particles that float in the air and the way that
sunlight interacts with these particles. Our
sunlight is made up of the whole rainbow of colors
red, orange, yellow, green, blue, and violet. When
all of these colors of light are combined, they
make the white light that we see on earth.
But when you look up into the sky, you see blue.
The reason is that light bounces around on
particles suspended in the air (mostly water
molecules and dust), but the blue and violet
colors are scattered more than the other colors.
The scattering of the light means that more of
this light escapes down to you and your eyes as
you are looking up. Because the sun emits a
greater amount of blue light than violet light,
blue is the dominant color you see.
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