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[i]Without a strong sample size of folks who have undergone a space walk, they've found it rather tough to pinpoint the smell, with some former astronauts having called the odor akin to "seared steak," "hot metal," "welding fumes" or even "gunpowder." Now, NASA has enlisted the help of London chemist Steve Pearce — pro bono, mind you — to recreate the smell, hoping it will help in training exercises.
...mixing anecdotal discoveries together — Pearce says that seared steak and hot metal actually fall in line with each other and "lead us to conclude that the sensation is caused by some high-energy vibrations in particles brought back inside which mix with the air" — with the recent discovery of ethyl formate in space's dust particles (that's the same matter that gives raspberries their flavor), and there's a strong starting point for recreating the possibly sulfurous-like smell of space.[/i]
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