Because light is something, information can only go the speed of light, yet because darkness is nothing, it can go faster, more on it. https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3DJTvcpdfGUtQ&ved=0ahUKEwjez57lnJnjAhWDQc0KHYutBdYQo7QBCCgwAA&usg=AOvVaw0jMl7EKtcYDx167MxQpLn2