When astronauts perform missions outside the International Space Station, compounds in space will stick to their clothes: they are brought back to the space station, and the smell of the universe is on these special compounds, so they "smell" the universe The real smell: Outer space smells like the smell of a car race, mixed with the smell of hot metal, diesel and barbecue. These smell: If the byproducts of the violent burning of the stars that are about to die out, this byproduct is A strong-smelling compound, polycyclic aromatic hydrocarbons, these molecules flood the entire universe and will float forever. Comets, meteors and space dust all have their presence, and they were also one of the important ingredients when the life of the earth was first formed, Coal, oil, and even food on the earth have not been able to lack it. The following statements are consistent with the original:. ['The dying star produces PAHs during intense combustion.', 'PAHs are the foundation for the continuation and evolution of life on Earth.', 'A wide variety of compounds in space.', 'The cosmic odor is harmful to astronauts.']