What Does Space Smell Like? NASA Astronauts Describe Cosmic Scent

07/22/2012 09:41 am ET | Updated Jul 23, 2012

By: Life's Little Mysteries Staff
Published: 07/20/2012 06:55 PM EDT on Lifes Little Mysteries

Astronauts who have gone on spacewalks consistently speak of space's extraordinarily peculiar odor.

They can't smell it while they're actually bobbing in it, because the interiors of their space suits just smell plastic-y. But upon stepping back into the space station and removing their helmets, they get a strong, distinctive whiff of the final frontier. The odor clings to their suit, helmet, gloves and tools.

Fugitives from the near-vacuum — probably atomic oxygen, among other things — the clinging particles have the acrid aroma of seared steak, hot metal and welding fumes. Steven Pearce, a chemist hired by NASA to recreate the space odor on Earth for astronaut training purposes, said the metallic aspect of the scent may come from high-energy vibrations of ions.

"It's like something I haven't ever smelled before, but I'll never forget it," NASA astronaut Kevin Ford said from orbit in 2009. [Space Sights and Smells Surprise Rookie Astronauts]

But astronauts don't dislike the sharp smell of space, necessarily. After a 2003 mission, astronaut Don Pettit described it this way on a NASA blog:


The interior of the International Space Station smells a little more mundane. Pettit, who recently returned from a second six-month-long mission on the ISS, told, "[The space station] smells like half machine-shop-engine-room-laboratory, and then when you're cooking dinner and you rip open a pouch of stew or something, you can smell a little roast beef."  



Correction: A previous version of the image caption to this article stated that the photo was taken in 2006. In fact, it was taken in 1984.

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