While I haven't yet thought of my conclusion to the universe, I have with our solar system, which will more than likely be the beginning of the end.
Many scientists believe that, by the time the sun starts to get too hot for us on Earth, before the Red Giant stage, humans will be living on Mars. After that, it is predicted that we will have found our way to another solar system that can sustain life, possibly just a few days before the Red Giant stage. After that, although it will take many, many years, I believe that the sun will go supernova, it will be a large enough "Explosion" to destroy surrounding solar systems, however I believe that the remains of these planets/stars will form more stars, therefore going on for quite some time. For all we know, there could have been a new star formed millions of years ago that we havent seen yet.
And now since it feels that I've typed for a half hour I'm going to conclude this. Sorry if this has been a long, boring rant!