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Sirius Star1 - Emmi
Sirius Star1 - Emmi

... Canis major represented either a two-headed dog, a dog that was a gift from Zeus to Europa, or Orion’s hunting dog, helping him to fight Taurus. ...
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... Very little is known about Pluto. Its surface is extremely cold (-230 degrees C) and seems to be covered with frozen ices. In recent years it has been fairly close to the Sun and enjoying a brief summer. Surface ices have vaporized, producing a thin atmosphere. However, it is now retreating into the ...
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... temperature. When all the hydrogen is gone from the core, the reactions take place in the shell around the core, as the helium in side the core grows. The core then heats and contracts. The radius of the star expands quickly, the temperature of the star drops accordingly, the star becomes a red supe ...
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Ms. Kulesz’s Take on Solar and Lunar Eclipses!

... Robson, D. (1991). Let’s look up the planets. New York, ...
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... Not so White Dwarfs. They are as stable as a rock. Literally. A quadrillion years in the future all the stars will be gone, but the White Dwarfs will still be here. Their glow is fossil energy left from their youth as a regular star. ...
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... layer of the comet is called the nucleus. The coma and the nucleus make up the comets head, which is the brightest part of the comet. Some of the gas is pushed away from the sun by the solar wind. This forms the comet’s tail. • In 1705, Edmond Halley calculated that every 76 years the same comet wou ...
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... Compounds made up of the most common substances, or elements in living systems: carbon, oxygen, nitrogen, and hydrogen. ...
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... Compounds made up of the most common substances, or elements in living systems: carbon, oxygen, nitrogen, and hydrogen. ...
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... normal (perpendicular) of Earth’s orbital plane. ...
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Chapter 24 Vocabulary link - Flushing Community Schools

... in the solar system, has gaseous planet, has thin, dark rings, has the lowest density, has a thick outer a hydrogen, helium, atmosphere of methane atmosphere. hydrogen, helium, The methane makes ammonia, methane, and the planet blue-green water vapor, has large in color. The axis of rings has at lea ...
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... Stellar Chemistry Every star you see in the night sky is a distant sun. A sun, for part of its life, is a ball of plasma (ionized gas) that fuses atoms into larger ones, converting small amounts of mass into enormous quantities of energy, as dictated by E = mc2. Recall that in chemical reactions, ma ...
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... hydrogen in the center in 5Byr • Center of sun must shrink to get hotter to balance gravity – Sun will become a red ...
< 1 ... 172 173 174 175 176 177 178 179 180 ... 237 >

Standard solar model

The standard solar model (SSM) is a mathematical treatment of the Sun as a spherical ball of gas (in varying states of ionisation, with the hydrogen in the deep interior being a completely ionised plasma). This model, technically the spherically symmetric quasi-static model of a star, has stellar structure described by several differential equations derived from basic physical principles. The model is constrained by boundary conditions, namely the luminosity, radius, age and composition of the Sun, which are well determined. The age of the Sun cannot be measured directly; one way to estimate it is from the age of the oldest meteorites, and models of the evolution of the Solar System. The composition in the photosphere of the modern-day Sun, by mass, is 74.9% hydrogen and 23.8% helium. All heavier elements, called metals in astronomy, account for less than 2 percent of the mass. The SSM is used to test the validity of stellar evolution theory. In fact, the only way to determine the two free parameters of the stellar evolution model, the helium abundance and the mixing length parameter (used to model convection in the Sun), are to adjust the SSM to ""fit"" the observed Sun.
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