The blue color is caused by the air scattering
light from the sun - higher energy (bluer) light
scatters more than lower energy (redder) light,
which is why the sky looks blue and the sun
There's also dust in the air which is why
sunsets look red or yellow. Because there is
less air directly above you than at an angle, the
sky above you will usually look darker than the
sky just above the horizon.
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