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Episode 12: A Sun-centred universe
Episode 12: A Sun-centred universe

... where he had predicted them to be. At last his doubts had been proved right. He now had evidence to show that the Ptolemaic theory of an Earth-centred Universe was incorrect. He proposed to replace Ptolemy’s theory with a model in which the planets, including the Earth, went round a centrally situat ...
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...  The Copernisis puzzle is based on the Nicolaus Copernicus theory called the heliocentric or sun-center theory of the universe. He was a Polish astronomer best known for the astronomical theory that the Sun was near the center of the universe and that the Earth and other planets rotated around it. ...
Evolution of High Mass Stars
Evolution of High Mass Stars

... Massive stars will have very different evolutionary endpoints (remnants: neutron star or black hole vs white dwarf) ...
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SOLUTIONS TO PROBLEM SET # 3

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Estimating the total radiative power output from the hot outer layers

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The Planck blackbody spectral distribution

... The characteristics of black body radiation are manifest in a variety of different contexts for both science and technology. At a time when energy sources and consumption have become issues of national concern, it is useful to look at some basic limits determined by quantum mechanics and thermodynam ...
benchmarks and task analyses - I
benchmarks and task analyses - I

... 1. Take the class outside to a field or playground at least 600 feet in length. Tell students that the class will mark off the distances between the planets in the solar system and create a visual model. Remind students that the model will not be an accurate representation, but it will help them to ...
Solar System Distance Model Answer Key
Solar System Distance Model Answer Key

Influence of Opacity on the Pulsational Stability Of Massive Stars
Influence of Opacity on the Pulsational Stability Of Massive Stars

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... Midi, etc., and making use of the new discoveries emerging in physics, helped to unravel several secrets of our Sun. Using spectroscopy, one important property of our Sun was revealed – that it is like an onion; you peel one layer after another and thereby see different depths, different features an ...
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... • The terrestrial planets are round and have layers. • Atmospheres came from volcanoes and impacts. • Four processes produce surface features. ...
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Phys 214. Planets and Life

... metallic phases = large magnetic fields Less likely to be habitable if we assume life needs a solid surface or oceans. When we are looking for habitable planets in other star systems we should look for terrestrial planets. ...
1 Josh Machado Science Section C. Language Arts Section E. 5/15
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... numerous varieties of stellar corpses that can be left behind. When stars around the size of our sun die, they become red giants, and eventually white dwarfs. A white dwarf is a small, dense leftover core from a red giant, that can burn for billions of years. Larger stars, more than eight times the ...
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G. Volkov (PNPI, Gatchina)

... How could it happen that a significant number of physicists, both theoreticians and experimentalists, met all of our proposals with complete bewilderment and even anger-backlash and hysterical insults without taking into account such natural argument that any theoretical views have individual chelov ...
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In-medium properties of nuclear fragments at

... other nuclear species. By analyzing experimental data it was found: -- decreasing the symmetry energy of primary hot fragments by ~ 40% when the systems evolve toward full multifragmentation (with increasing excitation energy and decreasing the freeze-out density): ALADIN, FRS, MARS; -- as a result ...
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Facts Concerning the Solar System

... The planets all revolve in the same direction about the Sun. The Sun and the planets, with the exception of Venus and Uranus, rotate on their axis in the same direction. With the exception of Uranus, the tilt between the equator and the orbital plane of the Sun and planets is small. ...
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6. Solar wind acceleration
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... nothing can escape, not even light. This is a black hole. • No light, radio waves, or any form of radiation can get out of a black hole. Astronomers can not see black holes directly. • Astronomers can detect black holes indirectly – Gas pulled in rotates so fast that it heats up and gives off X-rays ...
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Evolution of Population II Stars in the Helium
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... * Present address: Mount Wilson and Palomar Observatories, California Institute of Technology, Pasadena, California, U. S. A. ...
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Production of Manganese-53 in a Self

... for the highest mass stars, production of 53Fe is decoupled from that of 60Fe. While stars less than 25 Solar masses inject both 60Fe and 53Mn, the very high mass stars eject 60Fe without much 53Mn. This allows for the large spread in the 53Mn/55Mn ratio for a given ...
The Night Sky - Faculty
The Night Sky - Faculty

< 1 ... 93 94 95 96 97 98 99 100 101 ... 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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