Quote:
Originally posted by Kavish
Again this myth that Earth is habitable or situated at a perfect place in the Universe to sustain life. Every planet is habitable to their own species. We live here because we evolved here. We adapted to the elements which surround us, and live through that. On a planet void of oxygen or water, there may be species living based on other elements.
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You're talking about other types of biochemistry. And scientists did consider that at one point in time. But there is actually no real alternative tupes of biochemistry. Only the carbon-based aqueous system that we know on Earth is chemically viable of ALL known elements.Silicon is the closest competitor to carbon-based biochemistry and is too inert to support living chemistries at all, so it is doubtful that any silicon-based life forms exist in our universe; the chances are even slimmer for arsenic-based and methane-based lifeforms. That's why scientists prefer searching for carbon-based life over all proposed hypothetical alternatives.