In this video I show you what would happen if the earth were to be hit by a grain of sand going 99.9% the speed of light. I talk about the physics of it and then I try bigger objects hitting earth at near light speeds. Created with Universe Sandbox http://universesandbox.com/ Follow me on Twitter: https://twitter.com/theactionlabman Facebook: https://www.facebook.com/theactionlabofficial/ Instagram: https://www.instagram.com/therealactionlab/ Watch other popular videos from my channel Superhydrophobic Knife Slices Water Drops in Half https://www.youtube.com/watch?v=Ls_ISb7lG-I Real-Life Invisibility Cloak Can Hide Anything! How Does It Work? https://www.youtube.com/watch?v=_miP7-VrIXU What's Inside the Worlds' Fastest Heat Conductor? https://www.youtube.com/watch?v=OR8u__Hcb3k Can You Use Umbrellas Instead of a Parachute? https://www.youtube.com/watch?v=zm_7txMrG5U Opening a Bottle of Liquid Nitrogen Under Water! https://www.youtube.com/watch?v=pXlJMTx4kW4 Warning: DO NOT TRY—Seeing How Close I Can Get To a Drop of Neutrons https://www.youtube.com/watch?v=jAgBiFWd-yA *Any experiment you try is at YOUR OWN RISK. The Action Lab assumes no responsibility for any injury if you attempt anything you see in this video or on my channel.