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Atmosphere of Mercury

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Mercury 101 | National Geographic

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What would It be like to stand on Mercury's surface?

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What Chemicals Make Up Mercury's Atmosphere? : Outer Space

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What Is Mercury's Atmospheric Pressure? : Planets, Stars & More

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The Planet Mercury: Astronomy and Space for Kids - FreeSchool

Mercury has a very tenuous and highly variable atmosphere containing hydrogen, helium, oxygen, sodium, calcium, potassium and water vapor, with a combined pressure level of about 10−14 bar. The exospheric species originate either from the Solar wind or from the planetary crust. Solar light pushes the atmospheric gases away from the Sun, creating a comet-like tail behind the planet.
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    • Composition 

    • Properties