The Surprising Importance of Stratospheric Life (2016)

> If the rigors of air travel can prepare microbes to thrive in Antarctica, why not the atmosphere of Venus, where relatively mild temperatures and pressures may be able to sustain Earthly life?

Maybe the upper atmosphere of Venus. I gather that there's a narrow band at ~55 km, where the temperature is moderate. But then there are the sulfuric acid clouds. So maybe more like hot springs.

So I know the organisms likely for after a week in the stratosphere, but the resiliency of the cells mentioned make it seem impossible that we didn't take life to mars.