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Why is the sky blue (and sunsets red)?

Show of hands — before you project anything

Predict first: sunlight looks white. Do you think it's just one color, or all the colors mixed? How could we find out?

  • A Way more than you'd guess
  • B About what you'd guess
  • C Way less than you'd guess

Count the votes out loud. Hold them to it — then watch.

Project it (fullscreen)

Discussion prompts

  • Predict first: sunlight looks white. Do you think it's just one color, or all the colors mixed? How could we find out?
  • Predict first: at sunset the light crosses way more air to reach us. Which colors do you think survive that long trip, and which get bounced away?
  • Violet light actually bounces even more than blue. So predict — why isn't the sky purple?

Where it shows up in real life

  • A blue sky on a clear afternoon
  • An orange and red sunset out the window
  • A rainbow, where white sunlight splits into all its hidden colors

A prediction-first worksheet — no answer key.

zero prep · no login · any projector

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