Swings and roundabouts. An astronaut has a greater risk of dying in an accident than most people, but the greater amount of fitness required increases the chances of living a long life if they don&#x27;t have any accident.<p>Conversely, there is much less of a risk of a fatal accident in a desk job - but long, stressful, hours combined with a bad diet and lack of exercise can massively increase the chance of dying early from heart disease or stroke.