Venus was wet: a measurement of the ratio of deuterium to hydrogen.
نویسندگان
چکیده
The deuterium-hydrogen abundance ratio in the Venus atmosphere was measured while the inlets to the Pioneer Venus large probe mass spectrometer were coated with sulfuric acid from Venus' clouds. The ratio is (1.6 +/- 0.2) x 10(-2). The hundredfold enrichment of deuterium means that at least 0.3 percent of a terrestrial ocean was outgassed on Venus, but is consistent with a much greater production.
منابع مشابه
Pre-Clinical and Clinical Data Confirm the Anticancer Effect of Deuterium Depletion
The two stable isotopes of hydrogen, protium (1H) and deuterium (2H) differ in their physicochemical nature. Deuterium-depleted water (DDW) significantly inhibited the growth rate of different tumor cell lines in culture media and xenotransplanted MDA-MB-231, MCF-7 human breast adenocarcinomas and PC-3 human prostate tumors in vivo. The apoptosis-triggering effect of DDW was demonstrat...
متن کاملFractionation of hydrogen and deuterium on Venus due to collisional ejection.
The fractionation factor f is important for interpreting the current escape fluxes of H and D on Venus and how the D/H ratio has evolved. The escape flux is currently governed by the two processes of charge exchange and collisional ejection by fast oxygen atoms. Using a best-fit parameterized equation for the O-H scattering angle phase function, more accurate branching ratios for the oxygen i...
متن کاملWater on Mars and Venus
This paper reviews evidence relating to the abundance of water on early Mars and Venus from measurements of the present abundance of hydrogen compounds, deuterium to hydrogen (D/H) ratios and escape fluxes. For Mars, recent measurements of D/H ratios in SNC hydrous minerals provide data on the ratios at earlier times to augment present atmospheric values. Interpretation of these data shows that...
متن کاملCometary Water on Venus: Implications of Stochastic Impacts 1
The short lifetime of water on Venus suggests t ha t the water abundance is in a near steady-state balance between loss by escape and replenishment by infall. In addition, the observed deuterium-to-hydrogen ratio on Venus is consistent with a steady state and does not necessarily imply a past water excess. We present results of a model incorporating a stochastic cometary source and nonthermal e...
متن کاملComparison of physical, chemical and hydrogeological characteristics of karst springs in the western and eastern regions of Ilam province, Iran
Karst springs in the western and eastern regions of Ilam province have different physical and chemical properties. The springs of the western regions, are sulfuric and thermal with high salinity; while, springs in the eastern regions, are fresh and cold. Geological, hydrogeological, hydrogeochemical and isotope studies were performed to compare and determine the factors affecting the physical ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Science
دوره 216 4546 شماره
صفحات -
تاریخ انتشار 1982