Titan, Saturn's largest moon, may have its own Dead Sea. A fake lake simulating conditions there hints that the moon may host ethane pools brimming with benzene, just as the Dead Sea on Earth is packed with salt.

Titan is arguably the most Earth-like body in the solar system, boasting lakes, rivers, clouds and rainfall. But the moon's frigid temperatures mean its liquids are hydrocarbons like ethane or methane, rather than waterMovie Camera. When sunlight interacts with the atmosphere it regularly creates fresh organic compounds like benzene – a chemical found in gasoline – and these fall like snow.

"Titan is a very similar Earth – just totally different," says Michael Malaska, who headed up the experiment at the Jet Propulsion Laboratory in Pasadena, California. "We're trying to figure out how the moon works as a whole."

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