Smell

Upon returning to spacecraft after spacewalks, astronauts report a metallic, slightly acrid aroma, often compared to seared steak, hot metal, or welding fumes. This scent is believed to come from dying stars.

Astronauts returning from spacewalks report a unique aroma clinging to their suits, attributed to polycyclic aromatic hydrocarbons. These molecules are created by dying stars and exist throughout the cosmos, giving space its peculiar scent.

The olfactory bulb, which processes smells, is directly connected to the amygdala (emotion) and hippocampus (memory) parts of the brain. This bypasses the thalamus, explaining why smells trigger vivid memories.

Upon returning to the spacecraft after spacewalks, astronauts often describe the smell of space as a mix of hot metal, seared steak, and welding fumes, possibly due to high-energy vibrations in particles.

Petrichor is the earthy scent produced when rain falls on dry soil. It's caused by a combination of oils released from plants and a chemical called geosmin, produced by bacteria, which becomes airborne with the impact of raindrops.

Olfactory memory is remarkably powerful and long-lasting, often linked to vivid emotional recall. This vast capacity allows us to distinguish a wide array of smells, from subtle perfumes to complex food aromas, influencing our perceptions daily.

Upon returning to the airlock after spacewalks, astronauts often describe a distinct, pungent aroma clinging to their suits, reminiscent of a metallic, smoky, and slightly sweet scent. This is thought to be caused by high-energy vibrations of ions in space.