Genetic analysis revealed that some microbes in the upper atmosphere are related to bacteria thought to catalyse ice-crystal formation and cloud condensation2. The fundamental process, called nucleation, occurs when water molecules in the air coalesce around a seed particle, often dust or soot. Depending on temperature, these complexes can grow into large water droplets or frozen balls of ice, leading to cloud formation and rain or snow.
The latest findings support emerging theories that bacterial communities, especially in the upper atmosphere where dust is relatively rare, could influence weather and climate3, says study co-author Athanasios Nenes, an atmospheric scientist at the Georgia Institute of Technology.
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Today, oxygen takes up a hefty portion of Earth's atmosphere: Life-sustaining O2 molecules make up 21 percent of the air we breathe. However, very early in Earth's history, O2 was a rare — if not completely absent — player in the turbulent mix of primordial gases. It wasn't until the "Great Oxidation Event" (GOE), nearly 2.3 billion years ago, when oxygen made any measurable dent in the atmosphere, stimulating the evolution of air-breathing organisms and, ultimately, complex life as we know it today.
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