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Alien life may not be carbon-based, new study suggests
(www.space.com)
This is a most excellent place for technology news and articles.
It's been a long time since I took a biology course, but I think the reason why we believe carbon-based life is more likely is because carbon is far more likely to bond with other elements to form the complex structures nessecary for life at a molecular scale. The only other element that comes close is silicon and it's no where near as good as carbon.