• What we see is the light in the atmosphere (Air and dust as well as the reflection from the ground and ocean) it turns blue.. in space it is black.
  • It depends on what you mean by sky. Our atmosphere has a blue tint, because shorter wavelengths like red and yellow are more easily absorbed by the molecules found in air. But so far, there really isn't a conclusive answer for why the universe appears black (with such an immense number of stars, it should be blinding), and that's referred to as Olber's Paradox.
  • not sure, never heard of that

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