Researchers from the NASA space agency say that data from their Cassini probe suggest primitive aliens could be living on Titan, the only moon around Jupiter with a dense atmosphere, the Telegraph reports. Data suggests life forms are breathing in this atmosphere and feeding on fuel on the surface, although the moon is too cold to support liquid water. In one study, researchers show that hydrogen gas in the atmosphere disappears from the surface, suggesting alien forms could be breathing it in. The second paper concludes there’s a lack of the chemical on the moon’s surface, concluding it may have been consumed by life. While there could be other explanations for the findings, “We suggested hydrogen consumption because it’s the obvious gas for life to consume on Titan, similar to the way we consume oxygen on Earth,” said lead researcher Chris McKay, an astrobiologist at Nasa Ames Research Centre.