User:Cemls

This is an old question that arrouses each time I look to the stars. Do those brilliant points we're seeing exist today? The problem is that some of them stars and galaxies are some millions of light years away, which actually means that light coming out of them and impacting on our retina has parted some millions of years ago, so if one of them had dissapeared, let's say, 100000 years ago, we would never know, because it would take that amount of years for us to stop seeing it emiting light. So, when we look at the sky, on a clear starry night, we're looking at the history of the universe, we're seeing how it was, from a few to millions of years ago. No one could assure that any of those brilliant points are still there. What I can't believe is that famous astronomers haven't realized of this simple fact, and they keep saying, for example: "a new young star has been discovered at some 10.000.000 light years from earth", or so, but I keep thinking that 10 million years is quite a long time to call it young, don't you think so?