The Why Files S02 E02 What Does Outer Space Smell Like?

The smells of the universe are not universal. Different objects in space, like comets, planets, moons, gas clouds each have their own distinctive aroma. The sci-fi show The Expanse describes the moon as having a gunpowder stink and it made me wonder how did they come up with that description. Does the moon really smell like gunpowder? Turns out it does.