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Triton retains an atmosphere primarily due to its significant gravity and relatively low temperature, which allows it to hold onto gases like nitrogen. Its geologic activity, including geysers that release nitrogen and possibly other gases, also contributes to maintaining its atmosphere. In contrast, Phobos is much smaller and has insufficient gravity to retain an atmosphere, as its weak gravitational pull allows any gases to escape into space easily. Additionally, Phobos lacks significant geologic activity that could replenish any transient atmosphere it might have had.

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1mo ago

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