Let's return to more sleepy science and ponder life on the moon, the makeup of meteorites, and the long, strange lives of comets as they wander through our universe. Spacey!   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 here: 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.