May 7 2011: The chances that a meaningful contact with "alien life" is so remote that the question is a waste of time. Further,it appears that debris from asteroid/comet impact with the Earth may contaminate at least local space. And even living things on Earth do not require DNA-see e.g., information on RNA viruses
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A comment on Conversation: When or if life is found on other planets, isn't it possible that the coding for life, the DNA, would be the same or similar to our own?