Apparently, outer space has a scent...!
Chemist Steven Pearce, who was commissioned to the task of re-creating the scent of outer space tells Manchester Evening News:
"We have a few clues as to what space smells like. First of all, there were interviews with astronauts that we were given, when they had been outside and then returned to the space station and were de-suiting and taking off their helmets - they all reported quite particular odours. For them, what comes across is a smell of fried steak, hot metal and even welding a motorbike, one of them said."
“We have already produced the smell of fried steak, but hot metal is proving more difficult (...) We think it’s a high-energy vibration in the molecule.” (Chemist Steven Pearce interview to The Times).
Thanks to Siobhan for the tip!