Life could be anywhere so of course that includes large stars that become supernovas. Life would definitely be snuffed out in such a scenario (everywhere in its solar system and far beyond). Our Sun has an effective "main sequence" phase of approximately 10 billion years but life on Earth probably only has another 1 billion years (which is way before it goes into its Red Giant phase). This is because it burns about 10% hotter for every billion years and that is predicted to be more than life on Earth could stand. Regarding radio waves coming back around to Earth time after time...this doesn't happen. We may receive such waves if they just haven't yet had time to reach us but there is no "coming back around". The Universe is thought to be flat. Even if it's not, not enough time would exist for anything to ever come back around. For one thing the Universe is huge if not infinite and for another it's expanding faster than the signals are travelling.