Ask A Spaceman!

How do planets get their magnetic fields? What’s a dynamo? What do magnetic fields have in common with plate tectonics? I discuss these questions and more in today's Ask a Spaceman! Follow all the show updates at askaspaceman.com, and help support the show at patreon.com/pmsutter! Keep those questions about space, science, astronomy, astrophysics, and cosmology coming to #AskASpaceman on Twitter@PaulMattSutter and Facebook/PaulMattSutter for COMPLETE KNOWLEDGE OF TIME AND SPACE! Music by Jason Grady and Nick Bain.