Hospitals, bakeries, supermarkets and department stores. They all have one thing in common – their own distinctive smells. And according to astronauts, outer space also has its own unique aroma. In fact, the smell of space is so distinct that NASA enlisted the help of fragrance manufacturer Omega Ingredients to recreate the scent for use in its training simulations. So what does space smell like? The best description is a potent bouquet of Nascar race track, hot metal, barbeque and diesel fumes.