Data from the Cassini spacecraft shows fog at the south pole of Titan.

(Mike Brown/Caltech)

One of our solar system's largest moons has fog on its surface, a team of scientists has found.

The big discovery was made on Saturn's moon Titan, according to Discovery News. It's been known since 2009 that the moon had fog and high humidity aloft, which meant there was rain. But this new discovery came when the researchers looked deeper at data found at the surface from the European Space Agency's Huygens lander, deployed onto the moon for a brief period of time in 2005, the report added.

"The process of detecting this fog was, we took the Huygens Side Looking Imager data from data archives, restricting the images to those taken after landing," Christina Smith, a York University researcher who led the study, told Phys.org.

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Because this moon is filled with hydrocarbons, Titan is an intriguing study for scientists because it's very similar to Earth's makeup billions of years ago, Discovery News also said. But Titan's fog isn't quite the same as Earth's fog– the foggy conditions on the Saturn moon are created from evaporation of liquid methane on the surface, while on our planet, fog forms when air cools to match the dew point, the report added.

This means there's a chance Titan has a "methane cycle" that resembles Earth's water cycle, Phys.org also said. If that's true, there could be new revelations from old data that the scientists say they hope to re-study.

"It's impossible to say what can be learned in the future," Smith told Phys.org.

This isn't the only foggy discovery made recently in our solar system. Back in November, scientists concluded acid fog has likely been responsible for dissolving rocks on Mars, according to a separate Discovery News report.

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