that are millions of white years away but the night is disappearing says manuel philip from the rosenheim planetarium. the physicist has set up a star park in the bavarian alps a protected dark zone where you can still view the firmament it's a sight most of humanity will rarely see. of it fresh on its once only twenty to thirty percent of us still see the night sky as it really is asleep other seventy to eighty percent of us can't see it like this anymore simply because of a vast increase in artificial light it's been increasingly swamping the night sky for the last ten to twenty years at least it consists of think that. primeval rhythms of light and darkness have been suspended in major cities the world's biggest urban centers are now forty times brighter than the night sky. the seventeenth century invention of street lighting lights out the entire planet. and nights are growing over two percent brighter every year. artificial light is a harmful a mission that has encountered killable effects on ecosystems. then if there's not enough darkness it changes things begin to breeding earlier