Alien planet concept: could a completely misty, dark atmosphere be possible?

I was thinking of creating an alien planet that orbits a star slightly past the habitable zone, but is kept warm by an extremely dense atmosphere, made primarily of a black gas, but still contains oxygen, nitrogen, and other gasses that support life on earth. If this is plausible, what gas could be the cause?

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Alien planet concept: could a completely misty, dark atmosphere be possible?

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