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Subtitle is a better heading and less border-line click-bait:

"Trace Gas Orbiter spacecraft did not find the gas in red planet’s atmosphere during its first months of operation"

Flummoxed is pretty fair in this case. The expectation is that any methane released into the Martian atmosphere should persist on long timescales. Either there is a unknown process which scrubs it quickly or previous measurements were in error.

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