COSMOMIND Science Mysteries — all

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Mystery #1Tier 2light

Why is the sky blue?

The Sun's light looks plain white, and the air is completely see-through. So where does all that blue come from, painting the whole daytime sky?

A clear, cloudless blue daytime sky — Photo: Jaggery · CC BY-SA 2.0 · via Wikimedia Commons

Your guess

What's your hunch — why is the sky blue, and not white or green or something else?

Make a guess to unlock the hints and the answer.