What is the smell of outer-space?

 

         There is no smell in outer space. Space is a vacuum, which means that there is no air or atmosphere to transmit molecules that could be detected by the human nose or any other kind of sensor. However, astronauts who have been on spacewalks or have returned from space missions have reported a distinct odour on their spacesuits or equipment after exposure to space. This odour has been described as a "burnt" or "metallic" smell, but it is not actually the smell of space itself. The odour is thought to be the result of the out-gassing of materials used in the construction of the spacecraft and spacesuits, which are released in the vacuum of space.

           "Space smell" that astronauts have reported is also attributed to other factors. For example, when spacecraft re-enter the Earth's atmosphere, the heat and friction can cause materials such as Teflon, Krypton, and other polymers to vaporize and create a distinct odour. Additionally, the smell could be the result of the reactions between the residual atomic oxygen and the materials in the spacesuit, which can create a metallic smell.

    It's worth noting that the smell of space itself is not detectable by human senses since space is a vacuum and there are no molecules to carry odours. In fact, one of the biggest challenges in designing spacesuits is creating a suitable atmosphere for astronauts to breathe and removing the carbon dioxide they exhale. Astronauts breathe a mixture of oxygen and nitrogen, and the atmosphere inside the spacecraft or spacesuit is carefully controlled and monitored to ensure the safety and comfort of the crew.

A question for the viewers. Please answer in the comment section.

Colombia, Challenger, Discovery, Atlantis, and Endeavour what are they?