What unusual gas ratio was observed in Comet ATLAS during its inward path compared to native solar system comets?

Answer

High levels of carbon dioxide ($ ext{CO}_2$) compared to water vapor

On its inward path, the comet displayed high levels of carbon dioxide ($ ext{CO}_2$) relative to water vapor, a ratio more commonly associated with comets farther from stellar warmth.

What unusual gas ratio was observed in Comet ATLAS during its inward path compared to native solar system comets?

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