Scientists may have found evidence that could point to life on Titan, the biggest moon of Saturn.

An analysis of data from NASA's Cassini probe shows depletions of certain chemicals on the surface. Back in 2005, Chris McKay, an astrobiologist at NASA, said one line of evidence for life would be unusual depletions of acetylene, ethane and hydrogen at the surface.

Two separate reports revealed the discoveries which were made by the Cassini spacecraft, which orbits Saturn and periodically approaches Titan. One shows that hydrogen, which should be evenly distributed throughout Titan's atmosphere, seems to be less prevalent near the surface.

The other showed that acetylene seemed to be absorbed by some unknown process. Previously, scientists had expected acetylene to be produced in Titan's upper atmosphere by sunlight hitting the complex mix of gases, and fall like snow to the ground. But an analysis of the data from Cassini doesn't appear to show any such coating.

While the findings aren't conclusive, some suggest the hydrogen and acetylene could be disappearing because they are being used by methane-based life in the same way life on Earth uses oxygen and other chemicals.

Experts cautioned that other explanations could be available for the results. For instance, the discovery of the disappearance of hydrogen could be mistaken, or there is some chemical reaction on the surface that converts hydrogen into something else.