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[HN] How would we know whether there is life on Earth? This bold experiment found out

www.nature.com How would we know whether there is life on Earth? This bold experiment found out

Thirty years ago, astronomer Carl Sagan convinced NASA to turn a passing space probe’s instruments on Earth to look for life — with results that still reverberate today.

How would we know whether there is life on Earth? This bold experiment found out

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