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Why is the sky blue?
On the Moon, the sky is black at noon. Back on Earth it's the same Sun, so the blue comes from our air: air molecules scatter blue light roughly four to five times more than red, so blue reaches you from everywhere.
Violet scatters even more, but our eyes see blue better. At sunset, light crosses far more air, so the blue scatters away and red gets through. Next: why do onions make you cry?
About this film
A 27-second widescreen (16:9) explainer film, made in the Risograph print style, published on 24 October 2026.
Under the same Sun, the Moon's noon sky is black and ours is blue: our air flings blue light at us from every direction, and at sunset so much is flung away that only red gets through.
The style: Risograph print. True spot-ink print: halftone dots, misregistration, drawn in code.
Scene by scene
- 0:00Hook: the Moon's sky is black at noon
- 0:03Same Sun on Earth, so the blue comes from our air
- 0:06Molecules scatter blue roughly 4–5× more than red
- 0:10So blue reaches you from everywhere
- 0:12Violet scatters more, but our eyes see blue better
- 0:15At sunset: far more air, red gets through
- 0:21End card: next film — why do onions make you cry?
Transcript
Why is the sky blue? On the Moon, it's black at noon. Back on Earth, same Sun. So the blue comes from our air. Air molecules scatter blue light roughly four to five times more than red. So blue reaches you from everywhere. Violet scatters more, but our eyes see blue better. At sunset, light crosses far more air. Blue scatters away; red gets through.
Next: why do onions make you cry? Follow for more explainers, or make your own at explain.film.
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