Well taking the pessemistic route, humans would only destroy another planet if they got on one, so i kinda hope they never do. Secondly i don't think we should be worrying about the sun dying as it's a long way off. Now if reincarnation is what really happens after death, then you'd better be worried, in a few million life times we'll be sat here on the future version of predecimal.com collecting those ancient euro coins from 2179, (except for Oli who'll have come back as a tree)... I don't think our solar system can offer us much hope, but we can aim to find out about next doors, afterall the grass is always greener on the other side of the fence. Anyhow i've got things to do can't sit here contemplating astronomy all day.