What does space smell like? Astronauts describe the unique scent

Ever wonder what outer space smells like?

After coming back from a spacewalk and pulling off their helmets, astronauts are hit with the scent of cosmic molecules that hitch a ride on their suits.

According to their descriptions, the smell is far from subtle.

Former NASA astronaut, Greg Chamitoff, said, "there's one smell up here that's really unique though... we just call it the smell of space. There's this really, really strong metallic smell and I don't know exactly what it is."

Others liken it to "sweet smelling welding fumes," "seared steak," or other odd combos such as this description on twitter from ESA astronaut, Alexander Gerst: "To me, space smells like a mixture between walnuts and the brake pads of my motorbike."

But what exactly is causing this cocktail of unique aromas? The short answer is dying stars.

Louis Allamandola, director of NASA's astrophysics and astrochemistry lab, says that as stars combust, they release polycyclic aromatic hydrocarbons, which explains the smell.

These molecules can also be found on Earth in things such as soot, car exhaust, burnt toast and charred meat.

So next time you accidentally leave the stove on too long and get a nose-full of your ruined dinner, just pretend you're in outer space!

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