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Organisms on Earth produce a wide array of durable “biofluorescent” materials. If those on other planets do, too, the Compact Color Biofinder should be able to detect them
Mars, the Wet Planet?OK, scientists probably are not going to hang that handle on the fourth rock from the sun and the second-smallest planet in the Solar System now. But if they had been around 3.5 billion years ago, they might have considered it.