uranus composition 82.5 percent hydrogen‚ 15.2 percent helium‚ 2.3 percent methane. Revolution The orbit of Uranus takes 84.3 year to complete one revolution around the Sun. In other words‚ 1 Uranian year is 84.3 Earth years. Special feauture Description Uranus was the first planet to be discovered in modern history. It was actually discovered by accident in 1781 by William Herschel. Like the other gas giants‚ Uranus has a very thick cloud cover and an atmosphere made up mostly of hydrogen
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Space orbital tourism Space tourism has been an emerging trend in our NASA organization as a means to supplement their budget as well as expand our reach in space. Combining forces with our neighboring countries we have come together to ensure a safe‚ clean‚ and improved future. Searching for sustainable energy sources‚ developing cutting edge technology and manufacturing stronger more durable building materials to protect and carry us into the next generation. NASA’s research and developments
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Chemistry (Chapter 4-9‚ 12) *Ionic compounds have relatively high melting temperatures. *Know about polar bonds‚ nonpolar bonds‚ avogadro’s number‚ and calculating the atomic mass (unit?) * Chapter 4: Basically about theories of atoms and the atom itself 4-1: Theories The Greeks believed that all matter was composed of earth‚ fire‚ air and water. Democritus: the first person to propose the idea of atoms (that matter was not infinitely divisible): atomos. “Atoms are solid‚ homogenous
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The effects of cigarette smoking on the development of thyroid eye disease in patients with Graves’ disease: A clinical review Summary points * Thyroid eye disease (TED) is thought to be caused by the stimulation of retro-orbital TSH receptors by thyrotropin receptor stimulating antibodies. * There is a strong association between cigarette smoking and the development and progression of thyroid eye disease. * Cigarette smoking has adverse effects upon treatments for Graves’ disease
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(kerosene) and liquid oxygen (LOX) as propellants‚ powering two Aerojet AJ-26 engines‚ which are modified Soviet-built NK-33 engines. Together they produce 3‚265 kilonewtons (734‚000 lbf) of thrust at sea level and 3‚630 kN (816‚100 lbf) in vacuum.[6] As Orbital has little experience with large liquid stages and LOX propellant‚ some of the Antares first stage work was contracted to the Ukrainian Yuzhnoye SDO‚ designers of the Zenit series.[11] The core provided by Yuzhnoye includes propellant tanks‚ pressurization
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The Discovery Of The Electron The electron was discovered in 1895 by J.J. Thomson in the form of cathode rays‚ and was the first elementary particle to be identified. The electron is the lightest known particle which possesses an electric charge. Its rest mass is Me <approximately equal> 9.1 x 10 -28 g‚ about 1/1836 of the mass of the proton or neutron. The charge of the electron is -e = -4.8 x 10^-10 esu <elec trostatic unit). The sign of the electron’s charge is negative by convention‚ and
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Europa i is the sixth closest moon of the planet Jupiter‚ and the smallest of its four Galilean satellites‚ but still one of the largest moons in the Solar System. Europa was discovered in 1610 by Galileo Galilei[1]and possibly independently by Simon Marius around the same time. Progressively more in-depth observation of Europa has occurred over the centuries by Earth-bound telescopes‚ and by space probe flybys starting in the 1970s. Slightly smaller than Earth’s Moon‚ Europa is primarily made of silicate rock
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Interatomic Bonding Tutorial Suggested Solutions 1. |Substances |Type of bonding |Type of structure | |H2O |Covalent |Simple molecular | |SiCl4 |covalent |simple molecular | |RbCl |ionic |giant lattice/ionic | |Si |covalent
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A Comparison of the Planets in the Sol System Shaun J. Sci350 December 19‚ 2004 Introduction Beginning Mercury‚ this paper will compare the nine planets and major moons of our solar system and describe their individual characteristics. At the end of this discussion‚ the habitability factor of these different worlds will be discussed as compared to that of the Earth ’s. A Brief History of the Sol System By radiocarbon dating meteorites‚ we know that roughly 4.6 billion
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usually have to be the same atom. You will find this sort of bond in‚ for example‚ H2 or Cl2 molecules. [pic] Note: It’s important to realise that this is an average picture. The electrons are actually in a molecular orbital‚ and are moving around all the time within that orbital. [pic] This sort of bond could be thought of as being a "pure" covalent bond - where the electrons are shared evenly between the two atoms. What happens if B is slightly more electronegative than A? B will attract
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