Saturn has 83 moons. But one of them, Titan, is special. That’s because it’s the only moon in the solar system with a substantial atmosphere. A cold one, to be sure, but an atmosphere nonetheless. On its surface, Titan’s got frigid rivers and lakes of methane. Below the surface, there’s ice. And below that, water. Lots of it.

Titan is big too—40 percent the size of Earth, in fact.

There might be even more to Titan than we already know. According to Avi Loeb, a Harvard physicist and a big proponent of an aggressive search for alien life, Titan not only could harbor strange forms of life in and around its methane rivers, it could also point us toward similar life on similar planetary bodies all over the universe.

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“Titan would be a bellwether for life on cold planets and moons,” Loeb told The Daily Beast. He detailed his theory in a new, peer-reviewed paper that is slated for publication in Research Notes of the American Astronomical Society. The paper appeared online on Dec. 2.

Read more: yahoo