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Hi @Smer,
Accordingly to some geologists methane can be produced in other processes as well. But the fact that a short lived "bio-indicator" is found in the martian atmosphere is encouraging.
It is also suggested that the methane can some from meteors.
@Onebitnews

Yes this is possible that methane can be composed of meteors because of the components contained in it, that give it a special color for example, Sodium atoms give the yellow or orange color, the iron atoms give it yellow, the magnesium atoms give it the greenish blue, the calcium atoms give it the violet color, and the silicon atoms give it the red color.

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