For Neptune

To the accuracy of the measurement of molecular weights for the giant planets, only hydrogen and helium have significant abundances. The relative proportions of these elements, expressed as the molar fraction He/H, are 0.068+0.002 for Jupiter, 0.068+0.013 for Saturn, 0.076+0.016 for Uranus, and 0.100+0.016 for Neptune (Lunine, 2004). None of these ratios are like those of the nebula (0.085, Table 4.1). 

Two of my three visions had now been vindicated—Danese had been murdered exactly as I foresaw, and the woman in the painting had been cursed by the same evil influence that had felled her husband. That left Neptune and his seahorse. I would trust the pyromancy and hunt for Neptune, but if I said that I would be asked why. 

Neptune is in a nearly circular orbit around the Sun at a 30.1 astronomical unit (a.u.) mean distance (4,500,000,000 km) from it, making it the most distant known Jovian planet (and probably the most distant known major planet, since recent findings indicate that the Pluto-Charon system is too small to be considered a major planet) from the Sun. Kepler s third law gives 165 years for Neptune s period of revolution around the Sun. Therefore, Neptune will not have made one complete revolution around the Sun since its discovery until 2011. 

Seaborg s team suggested the name plutonium for the new element, in honor of the planet Pluto. The two elements just before plutonium in the periodic table had also been named for planets uranium for Uranus and neptunium for Neptune. 

The composition of the outer planets is also very different from that of the inner planets. Mercury, Venus, Earth, and Mars are all made of rocky-like material with a density of about 5.5 g/cm3. By contrast, the outer planets seem to consist largely of gases (which accounts for their sometimes being called the gas giants) with densities of about 0.69 g/cm3 for Saturn to 1.54 g/cm3 for Neptune. These... 

Mantle 13.4 Earth masses consists of ice, liquid water, ammonia and other substances with a high electrical conductivity. As is the case for Neptune, ice dominates the structure of that planet. Therefore, they are called ice giants. 

Figure 9. Schematic diagram showing a second-generation MC-ICPMS instrament (ThermoFinnigan Neptune). This instrument utilizes double-focusing and is equipped with a motorized multiple-Faraday collector block with two channels that can be operated in high-resolution mode. Optional multiple-ion counting channels are also available for the simultaneous measurement of low-intensity ion beams. [Used with permission of Thermo Finnigan.]...

The latter group was probably responsible for the early bombardment of the protoplanets. Delsemme believes that the cometary nuclei of the members of the Jupiter family never experienced temperatures greater than 225 K. The values suggested for the others are Saturn family, 150K Uranus family, 75 K Neptune family, 50 K. During many million years, these comets got mixed together in the Oort cloud (which has a diameter of around 50,000 AU). 

The weather station is fitted with various sensors and is capable of monitoring the following parameters Time, indoor temperature, outdoor temperature, barometric pressure, wind direction, wind speed, rainfall and humidity. The water meter used in our demonstration is a Neptune (Neptune Measurement Company, 1984) impulse switch which develops an electrical impulse for every ounce of water flow. 

If, then, you would attain the longed-for goal, observe just measure in mixing the liquid substance of the Sages, lest that which is too much overpower that which is too little, and the generation be hindered. For too much rain spoils the fruit, and too much drought stunts its growth. Therefore, when Neptune has prepared his bath, measure out carefully the exact quantity of permanent water needed, and let there be neither too little nor too much. 

The samples purified with lEC were diluted to approximately 100 ppb Cu. These samples were injected into a Multicollector Inductively-Coupled-Plasma mass spectrometer (MC-ICPMS, Micromass Isoprobe at the University of Arizona and Neptune at Washington State University) in low resolution mode using a microconcentric nebulizer to increase sensitivity for the samples with lower concentrations of copper. The nebulizer flow was adjusted so that the intensity of the Cu beam remained constant at 2 volts. Both on and off peak blank corrections were applied to the data and yielded the same result. 

Neptune D. 1980. Descriptive statistic for detected priority pollutants and tabulation listings. Office of Water Planning and Standards, U.S. EPA, Washington, DC. TRDB-0280-001. 

The dissociation reaction predicted by Umemoto et al. s calculations has important implications for creating good models of planetary formation. At the simplest level, it gives new information about what materials exist inside large planets. The calculations predict, for example, that the center of Uranus or Neptune can contain MgSiC>3, but that the cores of Jupiter or Saturn will not. At a more detailed level, the thermodynamic properties of the materials can be used to model phenomena such as convection inside planets. Umemoto et al. speculated that the dissociation reaction above might severely limit convection inside dense-Satum, a Saturn-like planet that has been discovered outside the solar system with a mass of 67 Earth masses. 

This isotope had a half-life of about 24,000 years. It proved to be fissionable (56) and was the basis for the plutonium atomic bomb. Concentrated work on the new element was now begun by the Manhattan Project. The main work was done at Chicago. At this time it became desirable to have names for the elements which had previously been called simply 93 and 94 by the men who worked with them. The name suggested by McMillan, neptunium, was therefore adopted for 93, and by analogy 94 was named plutonium from the planet Pluto, next beyond Neptune in the solar system (53, 69). 

Newtons law of gravitation played that ideal role for planetary astronomy during the eighteenth century. Once a planetary orbit had been calculated, based on the ideal relation between a planet and the sun, any deviation from the calculated path was immediately seen as a challenge to the law and became a focus of concerned attention to seek an explanation, usually found in the gravitational effects of other planets. The most spectacular example of this was the discovery of the planet Neptune from the deviations in the orbit of Uranus. 

Hydrogen isotopic compositions, expressed as molar D/H ratios, of solar system bodies. The relatively low D/H values in the atmospheres of Jupiter and Saturn are similar to those in the early Sun, whereas D/H ratios for Uranus and Neptune are intermediate between the Jupiter-Saturn values and those of comets and chondrites. The Earth s oceans have D/H shown by the horizontal line. Mars values are from SNC meteorites. Modified from Righter et al. (2006) and Lunine (2004). 

Phase diagram for hydrogen, showing the conditions under which hydrogen changes from molecular (H2) to metallic (H+). Below the gray He saturation curves, He and H are immiscible. Adiabats for Jupiter and Saturn cross the saturation curve once H becomes metallic, but the Uranus (and presumably Neptune) adiabats do not reach such high pressures. 

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