Burr Ito @ututuy.org · Sep 21

This is an out-of-focus (on purpose) picture of a starry sky. The colors of the stars can be appreciated better this way. The color of a star tells its age. Bluer for younger, reddish for older stars. It took humankind a long time observing the sky and developing physics to understand this. ⚛️ 🧪 🔭

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Olga 🧶 · Sep 21

I use an out of focus picture of Orion from someone I followed on Twitter (forgot their handle) in my astrophysics lessons to show this. Makes it so much more visible!