Can Light Turn Objects Invisible? Light moves fastest in a vacuum with nothing impeding its travel. Once light hits a dense medium, it changes speed and direction. This can lead to some captivating optical trickery. Facebook Prev Article Next Article Discover Checkout these cool gadgets... Related Posts Tesla Powerwall Explained! – A Battery Powered Home Where Does Our Water Come From? Neil deGrasse Tyson on AI killer robots 3D printed cars could hit roads as early as 2016 A Year in the Life of Earth’s CO2 How Hot Can It Get? What Is The Maximum Temperature?