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The universe also has an aroma of hot metal and motorbike welding, NASA experts said.
The space agency has commissioned Steven Pearce of British fragrance firm Omega Ingredients to recreate the smells to help train spacemen.
He said: "When astronauts were de-suiting and taking off helmets, they all reported quite particular odours.
"We have already produced the smell of fried steak, but hot metal is more difficult."
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