When the weather forecast calls for April showers on Titan, the clouds of Saturn's largest moon rain methane, scientists reported Thursday.

As winter on the mysterious smoggy moon recently turned to spring, researchers using an infra-red camera aboard NASA's Cassini spacecraft detected signs of a "substantial" spring rain of the liquefied natural gas sprinkling across vast fields of dunes near Titan's equator. It's the first documented example of extraterrestrial rain, researchers said.

"The fact that there is rainfall on Titan is amazing," said planetary meteorologist Tetsuya Tokano at the University of Koln in Germany, who studies the moon but wasn't involved in the National Aeronautics and Space Administration project.

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