Yes, space does seem to have a smell, although we can't directly smell it in the vacuum of space.
While our noses don't function in the vacuum of space, astronauts have reported a distinct odor associated with space. This smell is not experienced directly in space but rather when they return inside the spacecraft, typically after an extravehicular activity (EVA), such as a spacewalk.
The Scent of Space
The most commonly reported description of the smell of space is a metallic aroma, often likened to:
- Welding fumes
- Seared steak
- Hot metal
Why Does Space Smell Like This?
The exact cause of this smell is still being researched. One theory suggests that it is caused by the breakdown of materials by atomic oxygen.
During spacewalks, the exterior of spacesuits and equipment are exposed to this atomic oxygen. When astronauts re-enter the airlock, the oxygen combines with other compounds, potentially creating the metallic smell they observe. It's also possible that small amounts of trace compounds are created that interact with the equipment to produce the smell.
This smell isn't due to anything being "in" space but rather to chemical interactions occurring on the surfaces of exposed materials upon reentry into a pressurized environment.
| Aspect | Description |
|---|---|
| Direct Smell in Space | Impossible due to the vacuum of space. |
| Smell Reported | Metallic, like welding fumes or seared steak. |
| Location of Smell | Reported on the surfaces of spacesuits and equipment after re-pressurization. |
| Possible Cause | Interaction of atomic oxygen with materials on the outside of equipment. |
