Atmospheres of some planetary bodies, such as Mercury, are almost nonexistent, as the primordial atmosphere has escaped the relatively low gravitational attraction of the planet and has been released into space. Other planets, such as Venus, Earth, Mars, and the giant outer planets of the solar...
Mercury - Atmosphere, Temperature, Radiation: A planet as small and as hot as Mercury has no possibility of retaining a significant atmosphere, if it ever had one. To be sure, Mercury’s surface pressure is less than one-trillionth that of Earth. Neverth
and oxygen atoms as constituents of Mercury's exosphere. No molecules were detected. The pressure of Mercury's atmosphere was determined to be about 10−12bar (compared to the 1bar atmospheric pressure at sea level on Earth). Ground-based telescopic observations in the visible region have iden...
Earth’s surface underwent a dramatic transition ~2.3 billion years ago when atmospheric oxygen first accumulated during the Great Oxidation Event, but the detailed composition of the reducing early atmosphere is not well known. Here we develop mercury (Hg) stable isotopes as a proxy for paleoatmos...
Mercury and Neptune's satellite Triton have been found to have only the most tenuous of atmospheres. Pluto is also thought to have an atmosphere. The deep hydrogen, helium, methane, and ammonia atmospheres of Jupiter, Saturn, and the other giant planets probably derive directly from the solar ...
The pressure of Mercury's atmosphere was determined to be about 10−12 bar (compared to the 1 bar atmospheric pressure at sea level on Earth). Ground-based telescopic observations in the visible have identified resonant scattering emission features attributed to sodium, potassium, and calcium as...
In this paper, thermal infrared spectra obtained by the infrared (IR) grating spectrometer (TIS) of the MERTIS (MErcury Radiometer and Thermal Infrared Spectrometer) instrument during the second Venus flyby of the BepiColombo mission are presented and analyzed. The MERTIS observations provide not on...
152 released on August 3, 2007 “Implementation of the 2004/107/CE Directive concerning arsenic, cadmium, mercury, nickel and polycyclic aromatic hydrocarbons in ambient air”. Publ. in GURI No. 213, September 13, 2007, Supplement No. 194 Gazzetta Ufficiale della Repubblica Italiana GURI (2010)...
Mercury and Neptune's satellite Triton have been found to have only the most tenuous of atmospheres. Pluto is also thought to have an atmosphere. The deep hydrogen, helium, methane, and ammonia atmospheres of Jupiter, Saturn, and the other giant planets probably derive directly from the solar ...
<10−6 mbar) and the low rate of energy input mean that, on characteristic dynamical time scales, only a small fraction of the chemical bonds of the main atmospheric constituents are broken. Laboratory experiments must respect this low dose per reactive molecule by evaluating the exposure time...