In this episode, Katie Mack and John Green discuss the wonder keeping the stars apart... dark energy.

Head to https://policygenius.com/crashcourse to get your free life insurance quotes and see how much you could save.

This show is a production of Complexly. If you want to help keep Crash Course free for everyone, forever, you can join our community on Patreon at  http://www.patreon.com/crashcourse 

Podden och tillhörande omslagsbild på den här sidan tillhör Crash Course Pods, Complexly. Innehållet i podden är skapat av Crash Course Pods, Complexly och inte av, eller tillsammans med, Poddtoppen.