Why do scientists believe water is NECESSARY for life outside the Solar System?

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Raphy

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I'm not sure I've ever heard the "why" whenever this statement is made. It's always just sort of announced that water is necessary but no explanation. The only thing i can think of is that for water to be in a liquid state on the surface of a planet that it must mean the planet is in the "goldilocks zone" around its star.

Is there anything else to this? chemistry wise or something that REQUIRES water and no other possible molecule we are unaware of?
 
the same reason that Slartibartfast designed fjords in Africa.

he won an award, you know.

(when you only have one example of something, you tend to be biased towards that example's conditions)
 
Because scientists believe water is essential to organs/cells. I do like to believe there are totally different 'chemistry' and 'biology' out there where they don't need 'water' as their life source. They may need 'rocks' to 'breathe', for example. Scientists are so limited to the knowledge they're exposed to that they don't know how to think 'outside' the box! ^_^
 
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