I think that the answer is in the article:
Quote:
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...because they did not appear to contain DNA, the essential component of all life on Earth...
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It's simply a case of logic. If the dust is a life form and is on earth, it must contain DNA. If it does not contain DNA and is on earth it cannot be a life form. Otherwise their statement is untrue and cannot be relied upon as a judgement of whether this is alien or not.
IMHO....makes sense to me anyway.
Travis