Astronauts report that outer space smells like seared steak and hot metal
Some trivia is so bizarre it forces you to rethink your entire understanding of the world. Check out the fact below, see how others reacted, and scroll down to dive into the verified science and history behind it.
Outer space itself is a vacuum, so there's nothing to smell in it — but astronauts returning from spacewalks consistently report a distinctive smell on their suits: a sharp, metallic odour often described as seared steak, hot metal, or welding fumes. Scientists believe the smell comes from high-energy particles from dying stars interacting with the polycyclic aromatic hydrocarbons (PAHs) present in the interstellar medium — essentially, the smell of the cosmic chemistry that built our solar system.
Space feels abstract and sensory-less — a void. Discovering it has a smell, and that the smell is weirdly specific and domestic (seared steak), makes the universe feel simultaneously stranger and more familiar.
The Science Behind It
Outer space itself is a vacuum, so there's nothing to smell in it — but astronauts returning from spacewalks consistently report a distinctive smell on their suits: a sharp, metallic odour often described as seared steak, hot metal, or welding fumes. Scientists believe the smell comes from high-energy particles from dying stars interacting with the polycyclic aromatic hydrocarbons (PAHs) present in the interstellar medium — essentially, the smell of the cosmic chemistry that built our solar system.
Why Your Brain Finds This Hard to Believe
Sources & Verification
OddlyHuman Editors
VerifiedWritten and fact-checked by the OddlyHuman Behavioral Science Team. We verify all psychological, sociological, and historical claims against peer-reviewed journals, primary sources, and established encyclopedias to bring you accurate insights.
Read our Editorial Guidelines →“Astronauts say outer space smells like seared steak and hot metal. The smell comes from high-energy cosmic particles interacting with interstellar matter that clings to their suits. 🌌🥩 #OddlyHuman”