“Known as the “confidence of life detection,” or CoLD, scale, its initial steps would merely reflect confirmations that a result is not linked to contamination or some obviously abiotic origin, whereas its final levels would represent robust follow-up observations solidifying a link to life.”
“The call for such a step-based approach is driven by the unescapable likelihood that any initial detection of alien life is likely to be ambiguous rather than a smoking gun: any glaringly obvious indication of alien life would have been clear by now, decades into the hunt.”
Cosmic Love 
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