When astronomer diane turn shack move to pittsburgh in nineteen eighty-one she noticed. Something big was missing from the night sky. When i grew up in new england you could just walk outside and look up and see the milky way. But when i arrived in pittsburgh the sky had started to decline in quality. Still she says at the time her students at carnegie mellon university were very familiar with the milky way they knew about stars and constellations. That is not the case anymore forty years later. I have to explain what the milky way is and describe what it looks like in a show pictures and they think those pictures are fake. Because of light pollution major constellations can be totally invisible in cities. The pittsburgh city council is now trying to do something about it with the help of scientists like turn check. It passed a dark sky. Ordinance last week to reduce light pollution. This city is going to replace streetlights with warm tone. Led lights and they're also going to install shields so that late doesn't travel up what we're trying to do is cut out the light at the blue end of the spectrum because blue light scatters more easily than red light in the atmosphere rate. That's why the sky is blue. So blue light scatters everywhere. It doesn't stay where your lighting and to measure progress. She has some help in the higher ups in august. The astronauts on the international space station took some pictures of pittsburgh for on a clear night. And that's the before shot. The astronauts are gonna continue to take pictures of pittsburgh so we will have during pictures and after pictures. Terzic believes that as the sky's get darker more people will look up. In wonder that means more people more children will be able to see it and the benefits of being connected to half of our universe. I can't overstate that. It's a spiritual thing to feeling of connection with the universe she's hopeful it will peak young people's interest in the stars above and encourage them to pursue subjects such as