(Source: Ames Research Center) This photo simulation shows a laboratory-created "chemical garden," which is a chimney-like structure found at bubbling vents on the seafloor. Credits: NASA/JPL-Caltech Full image and caption A laboratory-created "chemical garden" made of a combination of black iron sulfide and orange iron hydroxide/oxide is shown in this photo. Credits: NASA/JPL-Caltech Full image and caption This image from the floor of the Atlantic Ocean shows a collection of limestone towers known as the "Lost City." Alkaline hydrothermal vents of this type are suggested to be the birthplace of the first living organisms on the ancient Earth. Credits: D. Kelley...
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