What is the essential extraterrestrial resource utilization (ISRU) advantage of using methane?

Answer

It can be produced on Mars using the Sabatier reaction

The true reason for prioritizing methane is the ability to produce it on Mars by employing the Sabatier reaction, which combines Martian CO2 with hydrogen derived from subsurface water ice.

What is the essential extraterrestrial resource utilization (ISRU) advantage of using methane?

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