What Causes Auroras?

SciShow tackles a Quick Question with a longish answer: What causes auroras? TL;DR: It's a breathtaking display of particle physics in action. ---------- Messages from our Subbable subscribers: ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/artist/52/SciShow Or help support us by subscribing to our page on Subbable: https://subbable.com/scis...