Apart from burning more smoothly, and inflicting lower stresses on delicate satellites, liquid methane costs only 1% as much as liquid hydrogen.

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According to a new computer model, liquid methane in contact with a partially hydrogen-terminated diamond surface at extremely high pressures and temperatures spontaneously forms longer hydrocarbons, and hence the material of crude oil could be formed deep in the earth.

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This prompted suggestions in the 1980s that Titan could be entirely covered by a liquid-methane ocean.

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J-1's first stage, and Nissan will complete a liquid-methane-fuelled motor that it has in the works for the second stage.

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The liquid bio-methane produced by this process can be used in an existing LNG engine.

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Current designs can produce two kilowatts per cubic meter of liquid reactor volume and without any drawbacks (some models produce methane as a by-product, this tech does not).

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Siluria converts methane, the primary ingredient in natural gas, into liquid fuels and chemical intermediates.

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Its engines are fueled partly by methane, which the agency says is easier to handle and store than other propellants such as liquid hydrogen or hydrazine.

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