Astronauts on spacewalks are faced with the unfortunate problem of losing fingernails and other hand injuries upon returning to the spacecraft. Research shows that atmospheric pressure and glove design play a key role in this phenomenon.

In space, the pressure is significantly lower than on Earth, so artificial pressure is created inside the spacesuit. However, gloves held under pressure for extended periods of time can cause injury, including loss of nails.

Researchers working with NASA found that the nails of astronauts with wide metacarpophalangeal joints were particularly affected. This is because gloves put more pressure on these joints during movement, which can cut off blood flow and lead to tissue damage, including onycholysis, Science Alert reports.

The study also suggests that new glove models such as the 4000 series and Russia’s Orlan, which provide more joint space, may reduce the incidence of nail loss.

Experts recommend changing the design of gloves around the metacarpophalangeal joints to reduce the risk of injury and improve the comfort of astronauts in outer space.