Intergalactic Alien Interlopers: What Are Cosmic Rays? | How the Universe Works

Stream Full Episodes of How the Universe Works: https://www.discoveryplus.com/show/how-the-universe-works From Season 10, Episode 2: Curse of the Cosmic Rays An invisible danger hurtles towards earth, at close to the speed of light. What are Cosmic Rays? Subscribe to Science Channel: http://bit.ly/SubscribeScience Like us on Facebook: https://www.facebook.com/ScienceChannel Follow us on Twitter: https://twitter.com/ScienceChannel Follow us on Instagram: https://www.instagram.com/ScienceChannel/