Newslink: How Stratospheric Life Is Teaching Us About the Possibility of Extreme Life on Other Worlds

The presence of microbial life in Earth's stratosphere is not only opening up a new arena in which to study extremophiles but is also increasing the range of possible environments in which we may find life on other planets.

https://www.space.com/41096-stratosphere-microbes-extreme-life-alien-worlds.html