Since space itself is an airless void, there are no molecules to carry scent the way they do on Earth. But when astronauts return from spacewalks, their suits and equipment are coated in residual molecules from the vacuum of space. These compounds interact with oxygen inside the spacecraft, creating a distinct odor that fills the cabin.
Burnt Metal, BBQ, and Raspberries?
NASA astronauts have compared the smell to burnt steak, hot metal, and welding fumes—a sharp, smoky aroma that clings to their spacesuits. Others have reported hints of gunpowder and even a sweet, berry-like scent. Interestingly, the center of the Milky Way contains ethyl formate, the chemical responsible for the scent of raspberries and rum, suggesting that some parts of space might actually smell fruity!
What Causes the Smell of Space?
Scientists believe that space’s unique scent comes from polycyclic aromatic hydrocarbons (PAHs), compounds formed in dying stars. These molecules, present throughout the universe, are created in high-energy reactions like supernovae and combustion processes—hence the smoky, metallic scent reported by astronauts.
Why NASA Simulates the Smell of Space
To prepare astronauts for the reality of space, NASA has developed “space scent” training materials. Chemists have recreated the distinct aroma so astronauts aren’t caught off guard when they experience it firsthand. The smell may not seem important, but in the isolated environment of space travel, even small sensory experiences can have a psychological impact.
Could We Bottle the Smell of Space?
While NASA’s space scent is used for training, some companies have tried to replicate the experience for the general public. In 2020, a fragrance called Eau de Space was developed to mimic the scent of outer space, allowing people on Earth to experience the mysterious aroma without leaving the planet.
A Reminder of the Unknown
The smell of space is just one of the many strange and fascinating aspects of the universe. It’s a reminder that even in the vast emptiness of the cosmos, there are still invisible clues waiting to be discovered. For now, we can only imagine what the rest of the universe smells like—but thanks to astronaut experiences, we have a small glimpse into the olfactory secrets of space.
A Final Thought
While we may never experience the scent of space firsthand, it’s fascinating to know that the universe isn’t just something to see—it’s something that can be smelled, too. It’s one more reminder that space, despite its silence and emptiness, is full of mysteries just waiting to be explored.