Changing just two tiny letters can make a universe of difference. Tune in to this episode for the fascinating and historic difference between astronomy and astrology.

Our guest is award-winning science writer and MIT professor Marcia Bartusiak. Her latest book on physics, astronomy, and the history of science is Dispatches from Planet 3: Thirty-Two (Brief) Tales on the Solar System, the Milky Way, and Beyond.

What's the Difference? is proudly presented by Edgde, a new podcast platform that offers a completely ad-free a la carte experience. No paywalls. No exclusivity. Just easy access to your favorite podcasts at a price point they choose. Learn more at www.edgde.com/signup.

This episode includes a rendition of a song originally written by Johann Sebastian Bach. It was recorded by Kevin MacLeod and used here under a Creative Commons license.