Atmosphere of Mercury

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Notion

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Science and technology

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What Wikipedia says

Mercury, the closest planet to the Sun, has the weakest magnetic field and the smallest mass of the four terrestrial planets. It has an extremely tenuous and variable exosphere containing hydrogen, helium, oxygen, sodium, calcium, potassium, and water vapor, with a combined pressure of about 10−14 bar (1 nPa).

Excerpt from the Wikipedia article “Atmosphere of Mercury”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ricnun at English Wikipedia, CC BY-SA 3.0, via Wikimedia Commons.