Moss Spores Survive Nine Months in Space, Opening Doors for Off-Earth Ecosystems

Moss Spores Survive Nine Months in Space, Opening Doors for Off-Earth Ecosystems

By
Jamie Davis

Publish Date:November 20, 2025

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📰 The quick summary: Moss spores survived nine months exposed to the harsh conditions of space while attached to the outside of the International Space Station, indicating potential applications for future space colonization efforts.
📈 One key stat: Even moss spores fully exposed to UV radiation in space maintained an 86% germination rate compared to 97% for Earth-kept samples, demonstrating remarkable resilience to extreme space conditions.
💬 One key quote: “While moss may not be on the menu, its resilience offers insights into developing sustainable life-support systems in space. Mosses could help with oxygen generation, humidity control or even soil formation,” said Dr. Tomomichi Fujita, the lead author of the study.

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1️⃣ The big picture: Scientists have discovered that moss spores can survive extreme conditions in space, remaining viable after nine months attached to the exterior of the International Space Station. The study focused on Physcomitrella patens, or spreading earthmoss, which successfully germinated after returning to Earth despite exposure to vacuum, radiation, and temperature extremes. While inedible, these resilient plants could play crucial roles in future space missions by contributing to life support systems. The moss’s ability to withstand such harsh environments suggests it might help establish basic ecosystems beyond Earth, potentially aiding in soil formation on other planets.

2️⃣ Why is this good news: This discovery expands our understanding of what life forms can endure in the extreme conditions of space. Moss could become a valuable component of sustainable life-support systems for future space missions, helping with oxygen generation and maintaining humidity levels. The plants’ remarkable resilience may contribute to soil formation processes on other planetary bodies, potentially accelerating terraforming efforts. Creating self-sustaining ecosystems in space becomes more feasible with organisms that can survive radiation and vacuum conditions, bringing us one step closer to long-term human presence beyond Earth.

3️⃣ What’s next: Scientists need to determine if moss can actually germinate and grow under various extraterrestrial conditions, including different gravity levels and atmospheric compositions. Further research will examine whether these plants can actively contribute to ecosystem development in space environments. The next phase may involve testing moss growth in simulated Martian or lunar conditions.

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Read the full story here: The Guardian – Moss in space: spores survive nine-month ride on outside of ISS

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