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
The Outermost House retreat to visit whenever he could, but soon found he did not want to leave. "[A]s the year lengthened into autumn, the beauty and mystery of this earth and outer sea so possessed and held me that I could not go," he wrote in "The Outermost House". For the next couple of years, Beston would come and go from his dune refuge, keeping extensive notes on his observations of life on the beach. His meditation on surf ("The Headlong Wave"), experiences on the winter beach, and his view of life after his beach stay were molded together into one "Year