On Jan. 14, a flying saucer will parachute through the thick orange haze of a distant moon’s atmosphere. Descending through the hydrocarbon smog, the probe could crash into an icy mountain, plop in a pool of organic goo, or dive into a methane ocean. Welcome to Saturn’s largest moon, Titan, a place where organic chemistry appears to be a carbon copy of the infant Earth’s just before life got a foothold.
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