I don't worry about those things. I feel that any civilisation that has the capability for interstellar travel would have long since understood the laws of the

I don't worry about those things. I feel that any civilisation that has the capability for interstellar travel would have long since understood the laws of the universe and would have evolved past the need for a deteriorating, inefficient physical form. Think of the movie 'Lucy'. That's why I think there are no super-intelligent species out there, because either they blow themselves up due to petty issues like racism, nationalism, etc. or they have evolved past the need for physical form and basically just disappear off the face of the universe.