Why is the sky blue?

Why is the sky blue? Why isn't it purple? Why does the sky turn red and orange at sunset and sunrise? What's the sun's true colour? All the answers are here!

Images, animations and videos credits:
- NASA
- Pixabay
- Wikipedia / Newton's Experimentum Crucis (Grusche 2015)

Musics credits :
- https://www.bensound.com

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- https://www.facebook.com/ScienceWorld-106933907791981

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Видео Why is the sky blue? канала ScienceWorld