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For the first time, scientists have found lifeforms where nobody thought it was possible: floating in the troposphere, the slice of the atmosphere approximately four to six miles (eight to 15 kilometers) above Earth's surface. And not just a tiny few, but lot: 20% of every particle in that atmospheric layer are living organisms.
This has profound implications for our understanding of weather, the spread of disease, and life on other planets.
We did not expect to find so many microorganisms in the troposphere, which is considered a difficult environment for life. There seems to be quite a diversity of species, but not all bacteria make it into the upper troposphere.
Originally posted by retirednature
There's already a thread about this:
Bugs in the Atmosphere: Significant Microorganism Populations Found in Middle and Upper Troposphere