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 Making sense of irrational numbers The World’s First MRI of a SINGLE Atom Is Here How small are we in the scale of the universe? Aliens: Are We Looking in the Wrong Place? Why People Keep Seeing Crazy Stuff on Mars Where Are All the Electric Airplanes?