Atmosphere of Mercury Atmosphere of Mercury Mercury has a very tenuous and highly variable atmosphere (surface-bound exosphere) containing hydrogen, helium, oxygen, sodium, calcium, potassium and water vapor, with a combined pressure level of about 10 bar (1 nPa). 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. The existence of a Mercurian atmosphere had been contentious before 1974, although by that time a consensus had formed that Mercury, like the Moon, lacked any substantial atmosphere. This conclusion was confirmed in 1974
A Planet Called Treason This mission is only the beginning of the adventure for Lanik, who discovers the secrets of the most powerful nations and at the same time gains additional abilities to save his people and determine the fate of his planet. Lanik travels to many of the regions of the planet Treason throughout the book, and discovers that those residing in different regions have different powers or capabilities. He first passes through the land of the Ku Kuei while on his way to Nkumai, learning that they can control the flow of time in a bubble extending out from themselves. When he