A remarkable moss has defied expectations by surviving nearly nine months in the harsh vacuum of space. This tiny life form, known as Physcomitrium patens, not only endured but also thrived once it returned to Earth. This fascinating outcome is inspiring scientists as they consider the possibilities for life beyond our planet.
Researchers from Hokkaido University launched moss spores into space aboard the Cygnus NG-17 mission in March 2022. For 283 days, these spores faced extreme temperatures and cosmic radiation, conditions that would typically destroy most living organisms.
Tomomichi Fujita, the study’s lead author, remarked, “Most living organisms, including humans, cannot survive even briefly in the vacuum of space. However, the moss spores retained their vitality after nine months of direct exposure.”
The experiment’s setup was simple yet effective. The spores were placed on the International Space Station, directly exposed to the elements. They returned to Earth in January 2023 via a SpaceX Dragon capsule, showing that some plant structures can withstand space conditions remarkably well.
Upon return, the spores were cultivated in laboratory conditions. Surprisingly, about 86% of the exposed spores germinated, nearly as high as the 97% germination rate for spores that stayed on Earth. Fujita expressed astonishment at their resilience, noting that they expected nearly all spores to perish. Though there was a 20% decline in chlorophyll a, essential for photosynthesis, many spores grew successfully. Their dormant state and low water content likely contributed to this survival.
Scientists now have a model suggesting that these spores could potentially endure space conditions for up to 5,600 days, or more than 15 years. This finding challenges previous understanding of how long living organisms can last in the cosmos.
The implications are significant. Many experts believe that hardy organisms like Physcomitrium patens could be key to establishing ecosystems on Mars or the Moon. Instead of focusing solely on food crops, scientists are contemplating using these tough species to kickstart essential biological processes. They could help produce oxygen, manage humidity, and even assist in creating soil-like layers in hostile environments.
For instance, using moss in exploratory missions could support closed-loop systems necessary for sustaining life. Fujita is optimistic, saying, “Ultimately, we hope this work opens a new frontier toward constructing ecosystems in extraterrestrial environments.”
As space exploration advances, understanding how simple life forms can thrive will be crucial. This moss study is just the beginning—a glimpse into the potential for life to adapt beyond Earth.
For more details, you can read the original research published in iScience.
