Imagine a world where instead of water, the oceans are made of methane. Instead of swimming in H2O, you'd be paddling around in fizzy CH4. Such oceans actually exist on one of Saturn's moons, called Titan. In fact, the methane and ethane on Titan play a similar role to the water on Earth: they cycle through the atmosphere and form clouds that eventually rain down onto the surface. Buy could humans survive there?

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