Ep. 7: What’s Keeping the Stars Apart

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  See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.