Outer space smells like hot metal, fried steak and the welding of a motorbike, scientists suggest.

A chemist is recreating the smell to help NASA to train its astronauts.

NASA asked Steven Pearce, the managing director of Omega Ingredients, which makes fragrances, to recreate the scent after hearing of his work creating smells for an art exhibition in July, one of which was of the inside of the Mir space station.

Pearce is interviewing astronauts to help him with his task.

"We have already produced the smell of fried steak, but hot metal is proving more difficult," he said. "We think it's a high-energy vibration in the molecule."

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