Astronauts say space has a smell. They can't smell it out there, but after a spacewalk, when the helmet comes off, it hits them. The descriptions NASA collected: hot metal, gunpowder, "seared steak," and "sweet-smelling welding fumes." One ESA astronaut said walnuts and motorcycle brake pads. So we left the planet, and the universe smells like a man grilling in his garage while fixing the truck. What does your car smell like right now? Be honest.