When astronauts return from spacewalks, they consistently report a very peculiar and distinct odor clinging to their suits and helmets. Instead of a sterile vacuum, they describe the smell of outer space as a mixture of seared steak, hot metal, and welding fumes. This unexpected cosmic scent has been noted by multiple NASA crew members upon re entering the airlock.
Scientists believe this phenomenon is caused by high energy vibrations in particles brought back inside the spacecraft. When astronauts are working outside, dying stars release polycyclic aromatic hydrocarbons. These organic compounds float through the universe and cling to the fabric of the spacesuits.
When the airlock repressurizes, these spaceborne compounds mix with the oxygen inside the station, creating the metallic and meaty aroma. NASA even hired professional fragrance makers to recreate this scent on Earth to help train future astronauts for the sensory experience of orbit.
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Disclaimer: This video is for informational and entertainment purposes. The details are based on public astronaut accounts and scientific research, and the visuals are for illustrative purposes.
