A “toxic” smell detected on the International Space Station (ISS) by Russian cosmonauts led to emergency measures by the astronauts aboard led by Commander Sunita Williams.

Sunita Williams-led team encounters toxic smell at ISS, here's how the astronauts responded

Astronauts say that they have smelled unusual scents in space. However, that's not surprising due to the difference between the chemistry of Earth and space. Technically, one cannot smell anything in space as it is an airless vacuum.

Astronauts reveal what space smells like, and it’s stinkier than you’d expect

We generally know about particles. Everything is made up of atoms and molecules. We all know this. But when is comes to sense of smell, the molecular level understanding is something that's not common knowledge.

Understanding sense of smell: Scientists create 3D image of odour molecule

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