The scientific study of the origin, evolution, distribution, and future of life in the universe.

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What is the highest pressure at which plants can survive?

Inspired by this awesome question, I'm looking for the corresponding maximum: what is the highest air pressure at which plant life can survive? For example, Venus's atmosphere is about 90x as dense ...
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What are the tests performed by NASA's Mars rovers to establish that life could survive on the planet?

I am particularly interested in the Mars Rovers, which are out there trying to find life. Do they believe that the tests they perform are sufficient to verify the existence of life (Also please ...