Artemis II Crew Returns to Earth, Sparking Discussion on Spacecraft Environment

The four-person crew of NASA's Artemis II mission has returned to Earth and exited the Orion spacecraft. Following the event, former NASA astronauts have described the potential for noticeable odors inside a spacecraft after a mission, attributing astronauts' potential lack of awareness of such smells to a documented physiological effect of spaceflight.

Mission Return

The Artemis II crew completed its mission and was extracted from the Orion capsule after returning to Earth. The mission duration was approximately 10 days.

Descriptions of Spacecraft Environment

Former NASA astronauts have provided accounts of the environment inside a spacecraft upon hatch opening after a mission.

Former astronaut Garrett Reisman stated that after a 10-day period in space, the interior of a spacecraft can have an odor comparable to that of a locker room.

Reisman based this description on his experience with hatch openings at the International Space Station.

Former astronaut Mike Massimino noted that ground crew members responsible for extracting astronauts from the space shuttle have historically reacted with noticeable expressions, such as saying "Wow," when the spacecraft hatch is opened.

Physiological Context for Astronauts

The accounts include a scientific explanation for why astronauts themselves may not perceive these odors during a mission.

According to Reisman, astronauts in microgravity experience a fluid shift in their bodies. This shift causes puffiness in the head and congestion, which can reduce their sense of smell.

Reisman suggested this diminished olfactory sensitivity might prevent astronauts on longer-duration missions, such as those aboard the International Space Station, from noticing odors that could be present inside the spacecraft.