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Mercury is too small to retain a significant atmosphere, though it does have a thin layer of gas surrounding it with the density similar to the upper most regions of Earth's atmosphere (the exosphere). Plus, the surface temperature of Mercury is on average in excess of 100 degrees Celsius. Therefore, if someone suddenly appears on Mercury without any kind of protection, they will not only have no air to breath, they will be cooked in a matter of minutes.

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16y ago

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