Tonight, we relax and sleep with knowledge about Earth’s magnetism, why the sky is blue, how rainbows happen, and the origin of auroras that paint northern and southern skies. Lovely!   Help us stay ad-free and 100% listener-supported! Patreon: https://www.patreon.com/boringbookspod Buy Me a Coffee: https://www.buymeacoffee.com/d5kcMsW   Read “Astronomy for Young Folks” at Project Gutenberg: https://www.gutenberg.org/ebooks/45112   Music: "Exit Exit,” by PC III, licensed under CC BY   If you'd like to suggest a copyright-free reading for soft-spoken relaxation to help you overcome insomnia, anxiety and other sleep issues, connect on our website, http://www.boringbookspod.com.