Unsurprisingly, humans wouldn’t be able to survive on the surface of Titan, despite the fact it has an atmosphere. That dense lunar atmosphere is made up of approximately 95 percent nitrogen and 5 percent methane.
“The presence of methane is critical to the existence of Titan’s atmosphere,” Miller continued. “The methane is removed by reactions caused by sunlight and would disappear in about 30 million years after which the atmosphere would freeze onto the surface. Scientists think an internal source must replenish the methane, or else the atmosphere has a geologically short lifetime.”