AaS! 29: Why does E=mc^2?

Why does E=mc^2? Where does it come from? What’s the significance of that famous equation? I discuss these questions and more in today’s Ask a Spaceman!

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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.