Why Some of the Rainbow is Absent episode artwork

EPISODE · Jun 23, 2026 · 13 MIN

Why Some of the Rainbow is Absent

from Be Smart. · host Joe Hanson

We’re on PATREON! Join the community: https://www.patreon.com/itsokaytobesmart ↓↓↓ More info and sources below ↓↓↓ Over 200 years ago, scientists were looking at sunlight through a prism when they noticed that part of the rainbow was missing. There were dark lines where there should have been colors. Since then, scientists have unlocked the secrets encoded in these lines, using it to uncover mind-boggling facts about the fundamental nature of our universe and about worlds light-years away. Want to build your own DIY spectrometer? Mine is a modified version of this one from @exploratorium https://www.exploratorium.edu/snacks/cd-spectroscope And here's what you'll need to make one: https://amzn.to/3sbhr7C References: https://sites.google.com/view/whysomeoftherainbowismissing/home 0:00 Fraunhofer's mystery of missing colors 0:54 Playing with fire 2:11 Puzzle pieces and color codes 3:30 Electrons do the strangest things 5:40 How to make a rainbow analyzer 8:00 Using rainbows to understand the universe 9:57 Life beyond Earth 10:57 Final thoughts SUBSCRIBE so you don’t miss a video! ►► http://bit.ly/iotbs_sub ----------- High fives to all our Brain Trust Patrons: Holly, Brett, and Ashe Bullion Jaap Westera Millennial Glacier Mehdi Damou Barbora Bei Burt Humburg dani bowman David Johnston Baerbel Winkler Robert Young Eric Meer Dustin Karen Haskell Support us on Patreon! https://patreon.com/itsokaytobesmart Twitter http://www.twitter.com/DrJoeHanson http://www.twitter.com/okaytobesmart Instagram http://www.instagram.com/DrJoeHanson http://www.instagram.com/okaytobesmart Merch https://store.dftba.com/collections/its-okay-to-be-smart Facebook https://www.facebook.com/itsokaytobesmartpbs/​ Learn more about your ad choices. Visit megaphone.fm/adchoices

We’re on PATREON! Join the community: https://www.patreon.com/itsokaytobesmart ↓↓↓ More info and sources below ↓↓↓ Over 200 years ago, scientists were looking at sunlight through a prism when they noticed that part of the rainbow was missing. There were dark lines where there should have been colors. Since then, scientists have unlocked the secrets encoded in these lines, using it to uncover mind-boggling facts about the fundamental nature of our universe and about worlds light-years away. Want to build your own DIY spectrometer? Mine is a modified version of this one from @exploratorium https://www.exploratorium.edu/snacks/cd-spectroscope And here's what you'll need to make one: https://amzn.to/3sbhr7C References: https://sites.google.com/view/whysomeoftherainbowismissing/home 0:00 Fraunhofer's mystery of missing colors 0:54 Playing with fire 2:11 Puzzle pieces and color codes 3:30 Electrons do the strangest things 5:40 How to make a rainbow analyzer 8:00 Using rainbows to understand the universe 9:57 Life beyond Earth 10:57 Final thoughts SUBSCRIBE so you don’t miss a video! ►► http://bit.ly/iotbs_sub ----------- High fives to all our Brain Trust Patrons: Holly, Brett, and Ashe Bullion Jaap Westera Millennial Glacier Mehdi Damou Barbora Bei Burt Humburg dani bowman David Johnston Baerbel Winkler Robert Young Eric Meer Dustin Karen Haskell Support us on Patreon! https://patreon.com/itsokaytobesmart Twitter http://www.twitter.com/DrJoeHanson http://www.twitter.com/okaytobesmart Instagram http://www.instagram.com/DrJoeHanson http://www.instagram.com/okaytobesmart Merch https://store.dftba.com/collections/its-okay-to-be-smart Facebook https://www.facebook.com/itsokaytobesmartpbs/​ Learn more about your ad choices. Visit megaphone.fm/adchoices

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Why Some of the Rainbow is Absent

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This episode is 13 minutes long.

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This episode was published on June 23, 2026.

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We’re on PATREON! Join the community: https://www.patreon.com/itsokaytobesmart ↓↓↓ More info and sources below ↓↓↓ Over 200 years ago, scientists were looking at sunlight through a prism when they noticed that part of the rainbow was missing. There...

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