What dictates that extra terrestrial life requires water in the same way as we do? Even on earth we have fish who can’t live in the open air, and people who can’t live underwater.
What is to say that ET can’t eat space rocks to obtain all of its nutrients, or even more, what is to say that they require nutrients at all?
Edit: Thanks for all the wonderful answers. Makes perfect sense. They aren’t so much saying we HAVE to have water to create life, more that we only know how that works and looking for the unknown in the vast expanse that is the universe would be the worlds largest needle in a haystack game.
In: Planetary Science
>Why do scientists looks for water on other planets to prove life?
Because it is easier to look for life as we know it because we know so much about it. How would we recognise the signs of silicon based life forms? What would we look for? What signs would we be looking for to detect a ET that eats space rocks?
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