Mary´s prospect stands on the rock Velký Ostrý without four years for 170 years. She had experienced a lot to that moment. A lot of people climbed on it, once it even burned down. Today, at its top, stands new gazebo, nice, similar to the original, which was built there by prince Kinský himself. And the same stars take turns over it all the time. None of the stars shine the same from their inception to their demise. It is how the stars evolve or a layer of cosmic dust passes through them. There can be many causes. The light of the stars has been coming to us for hundreds to millions of years. An example is the star Betelgeuse, the second brightest star in the constellation of Orion, which is less than 600 light-years from Earth. And every time you look up to it in the sky, you see the past that is happening to us now.