Problemi have seen many articles that talk about a stars, Ask an Expert

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Problem:

I have seen many articles that talk about a star's "habitable zone" as the ring around it which is just the right temperature for planets to have liquid water, which is necessary for life.

Required:

Question: Why does a planet need to have liquid water in order to sustain life?

Question: Who says that extraterrestrial life can't live off of some other kind of sustenance?

Please describe in detail.

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Biology, Academics

Category:- Biology
Reference No.:- M91162133

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