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These otherworldly river systems are thought to be filled with liquid methane and ethane that flows into wide lakes and seas, some as large as the Great Lakes on Earth.

The gas entering the LNG facility is composed primarily of methane, but it also contains small amounts of ethane, propane, butane and other hydrocarbons collectively referred to as volatile organic compounds.

It's ethane and methane, so if there's anything swimming around in there, it would be life as we absolutely do not know it.

The plant uses ethane from a vast shale gas reservoir underneath Pennsylvania and surrounding states to make polyethylene, a plastic used in everything from consumer and food packaging to tires.

She measured the expected hydrocarbons—some methane, some ethane—but they didn’t add up to the total mass in her samples.